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1. Needless to say an average between both effects will be at around 64 although this does depend to some extent upon one s playing style and any velocity scaling imposed by the MIDI keyboard controller 3 DIR ON This item determines whether the bend direction will be decided by the attack velocity of the last note hit or the release velocity of the last note let up This choice is only relevant when the Auto Bend is configured to occur upon last note release as determined by the settings of Items 9 amp 10 below otherwise the attack velocity of the last note hit generally determines bend direction unless a note has been released before the bend starts in which case this release velocity will determine the bend direction This item takes two possible values ie ATK RLS As one would assume ATK indicates that bend direction is determined from the most recent attack velocity while RLS indicates that bend direction arises from the last release velocity 25 4 RVEL SCL This item determines the velocity scaling on the rate of the Auto Bend effect It ranges from 0 127 Values near zero will exhibit very little velocity scaling while larger values will bend much more rapidly depending upon the velocity value Whenever the Auto Bend is triggered on note release the rate scaling is determined by the release velocity of the last key let up Otherwise the rate scaling is determined by the attack velocity of the last key hit unless a
2. and keys may also be hit at any time to increment and decrement the displayed value If either of these keys are held down for a second or two the quantity is quickly auto incremented or auto decremented This will continue until the or key is released or when the quantity reaches its maximum or minimum allowed value Some items are not numeric in nature but accept a choice of character options In these cases the numeric keypad keys will have no effect The available items may be scrolled via the and keys if held down these keys again automatically step the values forward and reverse The list of options is stepped through in a circular fashion the list is not stopped at a maximum or minimum entry but keeps repeating The C key will reset the list to a simplest option usually OFF The K key has the same effect as the key when editing a character list it will step values forward This can be convenient as outlined in the K Key paragraph below Data is accepted by pushing Enter This causes the cursor to stop flashing and allows one to scroll to other menu items Note that the MIDI functions are continuously operational during the editing process MIDI commands can be sent while a quantity is being edited in order to ascertain the change effected The operation performed will reflect whatever is currently displayed If one is editing the 4 Voice setup parameters the 4 Voice is automatically re programmed
3. 14 below All other items in this menu i e notes on upon release etc will function with this item set at either mode The note buffer is remembered after power off i e the notes last entered still reside within the Interface once it is again turned on 14 OUT ORD This item specifies the order in which buffer notes are played It only has effect when OUT PLAY above is set to BUF otherwise this setting is ignored This option may be set to FWD RTRO CRCL NDWN MAP each option is discussed separately below FWD Notes are played from the buffer in forward fashion i e in the order in which they were entered Each additional note on will play the next note in the buffer When the end of the buffer is reached it wraps back to the beginning 21 RTRO Notes are played from the buffer in reverse fashion i e opposite the order in which they were entered Each additional note on will play the previous note in the buffer When the beginning of the buffer is reached it wraps up to the end CRCL Notes are played from the buffer in Cyclic fashion At first the notes are played as they were entered i e FWD When the end of the buffer is reached notes are played opposite the order in which they were entered i e RTRO When the beginning of the buffer is again reached notes are once more played in forward fashion and so on NDWN Buffer notes are essentially played in the forward fashion except the buffer increment
4. Sostenuto Pedal If the REC KEY option 12 is appropriately set in the SET MIDI OUT menu a nonzero value sent with MIDI controller 466 will put the Interface into record mode so that the internal note buffer is loaded This can be inhibited by the Key Safe feature as discussed below Record mode is turned off when a zero value is sent over this controller 67 Key Safe Soft Pedal The value sent with MIDI controller 67 can be used as a safety feature to inhibit spurious Bend Trill triggering or Note Buffer recording When selected under the KEY SAFE option 7 of the MIDI MODE menu the Soft Pedal must be down i e this controller must have transmitted a nonzero value during the appropriate trigger event otherwise the trigger is ignored 69 Note Trigger At MIDI Output Hold 2 A non zero value associated with MIDI controller 69 will cause any queued notes to be routed to the MIDI output A zero value of controller 69 will have no effect The interpretation of this command depends heavily on the settings of the Delay Trigger and Note Trigger Items 8 and 9 configured in the Set MIDI Out Menu 39 82 Auto Bend Trigger General Controller 7 A non zero value associated with MIDI controller 82 will trigger the Auto Bend effect A zero value of controller 82 will have no effect The interpretation of this command depends heavily on the settings of the Minimum Hold and Trigger Source Items 9 and 10 configured
5. in order to save into a different patch location or patch title scroll the display to show the patch number title and press K The patch number will flash and can be edited by conventional numeric means it ranges 1 through 99 If one then presses Enter or K is hit again the new patch number will be accepted and all 9 characters of patch title will begin flashing At this stage one has several options available as detailed below Editing ASCII patch titles through a keypad can be a tiring ritual One difficulty that I ve encountered in other devices with a similar user interface is the lack of any ability to copy the title of one patch easily to another for simple modification This is very handy for similar effects ie one may want to label a new patch COW BELL 2 especially if it is similar to another patch called COW BELL 1 It would be very convenient to copy the COW BELL 1 title into the current patch which we ll assume is called something else and just change the 1 at the end to a 2 This can be accomplished very easily with the Interface title editor When all title characters are flashing as described above one may hit the and keys to step through all patch titles displacements are relative to the current patch ie if we re editing patch 34 pressing will display the title of patch 35 If one obtains the desired title pressing Enter will latch it into the current patch or pressing K again will e
6. 22 Trill Amplitude Undefined The value sent with MIDI controller 22 basically sets the SWP BIAS parameter 6 of the Auto Trill menu This allows one to dynamically alter the trill amplitude although the trill frequency will be somewhat affected as well 38 23 Trill Waveform Undefined The value sent with MIDI controller 23 basically sets the WV SEL parameter 21 of the Auto Trill menu This allows one to dynamically alter the waveform used during a trill A value of 0 selects a pulse wave 1 selects a triangle and 2 selects a sweep 27 Autochord Mode Undefined The value sent with MIDI controller 27 allows one to set the mode of the Autochord function see the MIDI MODE menu A value of zero turns Autochord off A value of 1 turns Autochord on and sets the Interval to OCT A larger value also turns Autochord on but sets the Interval to USR 28 Play notes Buffer Undefined The value sent with MIDI controller 28 allows one to dynamically toggle the MIDI output between playing input notes or playing buffer notes it sets the OUT PLAY parameter 13 in the SET MIDI OUT menu A value of zero selects the input notes while any other value selects the note buffer The following MIDI controller commands trigger preset effects according to the current configuration of their corresponding menus No patch values are changed If the effect is not enabled these commands have no response 66 Load Note Buffer
7. MIDI Mode Menu This menu allows the MIDI input characteristics of the Interface to be specified This menu also contains several items which dictate the way in which the 4 Voice will respond to note on and note off commands these options can change the sound and operation of the 4 Voice significantly Each item in the menu is discussed independently below 1 CHANNEL This specifies the base MIDI input channel number and ranges 1 16 The interpretation of this parameter varies depending on what has been selected for the OMNI value as discussed below Note that the channel number is specified here as a patch loadable parameter This is not standard in MIDI gear for a very good reason ie a program change command can load a patch that listens to an entirely different channel potentially cutting off communication It was more convenient however to make this quantity patch loadable in the Interface software thus it was done this way Please be sure to check that the channel numbers in the patches used correspond to their intended values otherwise trouble could result when patches are changed 2 OMNI This item allows one to set the restrictions governing the Interface response to incoming MIDI data The possible values are OFF ON X CTLRS MULTI the action taken under each of these entries is detailed below OFF Omni mode is turned off The Interface will only respond to MIDI commands arriving on the channel number specified above
8. as a parameter is modified One should not however hold down the or keys while sending MIDI data ie Note On s The auto increment decrement functions use timers employed by other software and inhibit the MIDI data processing This can t cause any real problem but one might notice delays and or abbreviated auto bend trill functions as will be described later Hitting Enter when not in edit mode scrolls downward through the current menu list this can also be accomplished by hitting Hitting is the only means of scrolling backward in this case The Cancel button functions mainly as an Undo Exit command While editing a parameter hitting Cancel will cause the original value of the parameter to be restored and ends the editing operation If one hits Cancel when not in edit mode you will be bumped up a level in the menu structure or if already at the top level the patch number and title will be displayed which is the lead item in the top level list The non numeric keypad keys perform specific functions The discussion below summarizes their abilities Dot key This key always means Save Patch Whenever it is depressed the display will flash OVRWRITE and alternate with the the patch title that is currently stored in memory If it is desired to overwrite this patch merely push enter If one wants to preserve the original patch push cancel Another option exists at this point however which allows one
9. by one holding it down will produce an auto increment function Incrementing stops at the maximum allowed value When editing a character value the key will scroll upward through the list of available items again holding it down will auto increment When not editing pressing the key will scroll the display to the next parameter in the current menu this can also be accomplished by hitting the Enter key in this situation This scrolling function will not auto increment Minus Key When editing a numeric value pressing this key will decrement the value by one holding it down will produce an auto decrement function Decrementing stops at the minimum allowed value When editing a character value the key will scroll downward through the list of available items again holding it down will auto decrement When not editing pressing the key will scroll the display to the previous parameter in the current menu This scrolling function will not auto decrement Multiply Key X When at the top level menu hitting the X key will re program the Oberheim 4 Voice with the currently loaded parameters Upon depressing the X Key the message X TO PGM 4 V appears on the display Hitting X again will cause the 4 Voice to be programmed Hitting any other key cancels the operation Upon completion of the programming operation a confirmation message is displayed which is then cleared after hitting any key This operation might com
10. channel as set by Item 1 in the MIDI Mode menu It can be triggered immediately at Note On with optional delay at Note Off with optional minimum hold requirements or via MIDI controller 83 General Controller 8 It can also be triggered by hitting a specified key subject to the Key Safe protection Two parameters determining the Auto Trill effect are velocity sensitive the speed at which the Trill grows and the rate of Trilling itself When the Trill occurs on release of all notes the Trilling rate will be determined by the last note s attack velocity The Trill s growth speed is generally determined by the last release velocity When the Trill is triggered on note attack or delayed note attack both parameters are determined by the attack velocity of the last note hit unless a note has been released before the trill starts in which case this release velocity will determine the Trilling growth speed The allowed range of the Trill effect can be limited through the Maximum Swing parameter in the menu below Item 8 The net effect of pitch Trilling on the 4 Voice is also dependent upon the Pitch Bend and VCF Sensitivity settings in the 4 Voice Set up Menu After the trill growth is complete the swept parameters ie 4 Voice pitch VCF MIDI pitch bend or MIDI controller Tone Volume Balance will trill at their extreme values until either a new note is hit or the Interface is reset via the Silence button or other procedures The tr
11. described above the yy doesn t matter pp is the patch number to be written over if pp is 100 the next software revision will load all 99 patches in succession The Interface assumes that the data byte count is correct Excess bytes will be ignored but the patch may be only partially overwritten if insufficient bytes are sent Again these MIDI bytes are only 4 data bits at a time organized in low high order If the Write Protect is set to Y a keypad function on the key at the top level edit the Interface will not save the patch data into memory bring up the write protect warning on its display and complain with a NAK message Interface NAK Complaint F0 7E yy 7E pp F7 Again yy is the basic MIDI input channel and pp is the patch number that was commanded to be overwritten The 7E indicates a NAK this message is a standard in sampler dumps If the Interface was not under write protect and overwrote the patch it responds with an ACK message of the form Interface ACK Response FO 7E yy 7F pp F7 This message is essentially the same as the NAK except a 7F replaces the 7E The Interface won t respond at all and the patch memory will remain unchanged if the original memory load command was found to be faulty ie had a bad header or lacked the TF End of Sys Ex trailer Two additional System Exclusive Patch load commands are possible If pp is set to 101 the load dump commands will access the currently
12. dynamically changed via MIDI controller 23 waveforms can be changed in the midst of a trill giving interesting effects 22 POLARITY This item specifies the polarity of the trill waveform It has 3 possibilities UP DWN The setting produces a bipolar waveform that moves both up and down excepting the sweep which will move only up The UP setting will produce a waveform that goes positive while the DWN setting will produce a negative going waveform 32 11 The Tone Volume Balance Menu This menu allows one to set parameters governing the action of the on board audio processor an external stereo audio signal i e the 4 Voice audio output can be routed through this processor via the phone jacks at the rear of the Interface unit Baseline tone volume balance settings and optional key velocity sensitivities can be specified via the items listed below Crossfeeds into the Tone Volume Balance processor from the Auto Bend and Auto Trill effects can be specified in the Bend and Trill menus Rapidly changing or wide ranging control changes may cause a perceptible thump in low level audio signals beware All of the below items barring the velocity sensitivities may be dynamically altered through MIDI controllers see the next section for details 1 VOLUME This parameter specifies the baseline volume It ranges 0 through 255 The LED meters on the front panel show the input level of the audio signal and are not affected by
13. effect a 4 Voice program should be selected that has a quick attack amp long decay otherwise the transient voices will not sound but only blip if a sharp attack is selected The chord will only be produced for the first note hit if keys are held down subsequent keys will re allocate the Oberheim voices amp be heard but won t produce a chord This effect is only relevant to the 4 Voice and does not influence the MIDI output The Autocrd effect may also be dynamically turned on and off and the INTERVAL setting changed by MIDI controller commands 7 INTERVAL This item determines the intervals that will be played on the 4 Voice under the Autocrd effect discussed above It has three possible settings OCT USR SET OCT will produce the flammed unison or fifths octaves depending on Reassign Split Mode and Assign in the 4 Voice set up menu as discussed at length above USR will play an additional 3 notes whenever a new note is initially hit on the keyboard without any prior notes down using a set of intervals that are stored with each patch The interval is programmed via the SET option When SET is selected the first note hit is assumed to be the root of the chord and the next three notes that are depressed are used to determine the intervals The intervals are inverted appropriately so that all notes will be within 16 semitones of the root the root is assumed to be the lowest note lower notes are shifted up After the 4
14. have to be held down sufficiently long for the bend to be activated at the final note release The Auto Bend will always trigger under QUE mode immediately upon receipt of a non zero value for MIDI Controller 82 or key trigger note on CTLR This is the Controller mode It enables the Auto Bend effect to be selectively triggered by the MIDI Controller Auto Bend will not be triggered directly via any MIDI note activity regardless of the Minimum Hold setting MIDI Controller 482 and key trigger note on still have effect however If the Minimum Hold is set to zero the Auto Bend will trigger promptly upon receipt of a non zero Controller 82 value or key trigger note on If the Minimum Hold is non zero Auto Bend will not trigger immediately after receipt of Controller 82 or key trigger note on but will queue its activity causing the Auto Bend to trigger after all notes have been released 11 OUT CTL This specifies the destination of the Auto Bend effect for the MIDI output If itis zero causing the display to show PB rather that zero the Auto Bend will command the pitch bend over the assigned MIDI output channel If it is non zero it ranges up to 121 the assigned value denotes the commanded MIDI controller number addressed by the Auto Bend If the MIDI output is deactivated through Item 12 below this setting will have no effect 12 CONTROL This item determines devices that are commanded with the Auto Bend effect It can take
15. is set by the number of notes being held down If no notes are held down successive note ons will produce the next note in the buffer as in FWD If one key is held down every other buffer note will be played upon successive note on s If two keys are held down every third buffer note will be played and so on When the end of the buffer is reached or surpassed it wraps to the beginning MAP The note number being played is used as an index into the note buffer In other words MIDI note 0 selects the first buffer note note 1 selects the second buffer note etc If the note number is larger than the quantity of notes entered into the buffer the buffer is basically barberpoled i e it is repeated sequentially across the keyboard This option allows one to completely re define in a repeatable fashion the input vs output note relationship on the output synthesizer i e key x corresponds to note y 15 OUT VEL This parameter specifies a velocity increment that is added to the buffer pointer under all of the above options If this item is zero or the velocity of the key being played is very soft no additional increment is added to the buffer pointer If this parameter is set to a finite value the key velocity will be proportionally added into the buffer pointer to create a jump in the buffer playback This parameter ranges from 0 to 127 Smaller values will produce a noticeable and controllable effect Larger values will tend to ran
16. keys are hit the INTERVAL setting will be automatically changed to USR although this won t be shown on the display until it is updated When the current patch is saved the new chord will be stored with it so that the USR setting will still play its intervals when the patch is re loaded If a patch is saved with the INTERVAL setting still at SET the first four notes played after the patch is loaded will determine the chord that is played under AUTOCRD This trick enables one to create a patch that will define its chord upon being loaded i e via a MIDI program change command 7 KEY SAFE This item may be set ON or OFF It enables a safety feature when ON where the Soft Pedal MIDI controller 67 must be held down in order for key triggered effects to occur These effects include the Auto Trill and Auto Bend if they are enabled to be triggered by hitting a preset key and the Key Safe option is set ON the Soft pedal must be down while the appropriate trigger key is hit for the effect to start Key Safe is also used to guard against accidently overwriting the note buffer that can be programmed into the MIDI output see the last 4 items in the SET MIDI OUT menu The note buffer may be recorded over when a pre set key is hit or the Sostenuto pedal is pressed as determined by the REC KEY option in SET MIDI OUT If Key Safe is set ON the Soft pedal must also be depressed while the preset key or Sostenuto pedal is
17. loaded patch buffer In this case all parameters of the patch will be instantly active and no nonvolatile memory locations will be overwritten i e one must manually save the patch by hitting the key This option is useful for quickly debugging a patch and playing with parameters from a patch editor program If pp is set to 127 for the command requesting a dump from the Interface a lengthy dump will indeed be provided containing the patch data structures i e the menu formats and titles all item names maxium minimum limits options etc This dump is used by the patch librarian to initialize and formulate its variables and options 43 14 Patch Editor Librarian Program A handy patch editor librarian program was concocted to enable quick backup of the Interface unit s patch memory and aid in manipulating and experimenting with patch variables The program is called 4 V Librarian and it s written in MIDIBASIC on the Macintosh Launch by double clicking its icon This program requires the file 4 V DS to be resident somewhere preferably in the same folder as 4 V Librarian otherwise it asks for the location To use this routine connect a MIDI output from the Macintosh into the Interface s MIDI input and connect a MIDI output from the Interface to a MIDI input on the Macintosh Make sure that the MIDI input on the Macintosh i e MIDI Time Piece or JamBox has its echo off and doesn t route its MIDI input to the MIDI output
18. more prompt with this option OFF when the Fill mode is selected If the Fill mode is not activated under Item 7 below the setting of the Fill Delay will have no effect 6 FILL N This item allows one to specify the Fill Note sent under the output voice filling option which is described in detail under Item 7 below It may take one of two values ie SAME SEMI When set to SAME the fill operation will repeatedly send the same note as the latest received in order to occupy all remaining output voices This will work with some synthesizers ie the Mirage which allocate different voices with each new MIDI command and do not steal the same voice if the note is identical to one already sounding If SAME doesn t work with the device attached to the MIDI output the Fill Note may be set to SEMI This will send a succession of ascending semitones starting one above the last note received to occupy all residual voices The synthesizer on the MIDI output should be set to have a moderate to long attack if the Fill option is used particularly in the SEMI mode otherwise the brief notes sent to occupy the remaining voices may be heard 7 VOICES This item activates the output Fill mode and allows one to specify the number of voices available in the output synthesizer If one sets this value to zero where the display will show instead of 0 the Fill mode is deactivated and no extra Note commands will be sent to the output synthes
19. power glitch etc The other is labeled SILENCE it is basically a lower level reset function that clears internal software flags and sends an All Notes Off to both the 4 Voice and the MIDI output if the MIDI out is enabled in the current patch All data is retained under this operation and nothing is re loaded or hard reset thus this is the preferable way out of a bind If anything seems to be going strange hit this button first When the Interface unit is powered down glitches will be sent through the DIN cable to the 4 Voice potentially putting it into a random mode and turning several notes on This may be remedied immediately by pushing the black reset button added to the 4 Voice as outlined in Section 1 The two buttons to the right of the Interface keypad primarily control accepting and rejecting data 1e Enter amp Cancel as labeled The keypad is the primary mode of entering data This is basically a calculator keypad The numeric keys serve their original function Numeric data may be entered in various ways When the Interface is awaiting input the cursor generally flashes over the characters that are to be changed Numeric data may be entered by punching in a number as on a calculator If the number is too large or too many keys have been hit the quantity being changed will saturate at its maximum allowed value If the red C key is depressed while editing the number will be reset to the minimum allowed value The
20. pressed otherwise notes will not be recorded and the note buffer will not be overwritten If Key Safe is set OFF no check on the status of the Soft pedal is made before the bend trill effects and or note recording are triggered 14 6 The 4 Voice Set Up Menu This menu allows one to configure the 4 Voice hardware All of the contained items except for items 1 12 13 14 refer directly to switch and pot settings on the 4 Voice s Keyboard and Programmer modules or other hardware related parameters These switches must be set as listed in Section 1 for the parameters contained in this menu to be properly remoted The 4 Voice is configured immediately when any item is changed when a patch is loaded or when the X keypad option is used as described in Section 2 Many of these items may also be dynamically altered through MIDI controller commands Each menu item is independently discussed below 1 PLY NTES This option is the only item in this menu that does not refer directly to a switch setting or hardware parameter It means PLAY NOTES and can be set ON or OFF When set on the 4 Voice will respond to appropriate note commands When set off the 4 Voice is muted although the hardware is still re moded according to this menu and MIDI controllers program change amp pitch bend remain active The 4 Voice can still be played manually when this item is set OFF but no MIDI notes are sounded This item may be useful in a patch that d
21. show less velocity sensitivity and exhibit faster trill growth This quantity can be dynamically adjusted via MIDI controller 22 7 RTE BIAS This item allows one to specify a Trilling Rate Bias It also runs 0 255 This is essentially a base rate for the Auto Trill effect the velocity increment specified under Items 2 amp 3 is added to this to generate the net Auto Trill rate A low Rate Bias value ie O or so will exhibit fast trills and extreme velocity sensitivity provided that the Avel Scale in Item 2 is set sufficiently large A higher value of Rate Bias will show less velocity sensitivity and exhibit slower trills This quantity can be dynamically adjusted via MIDI controller 20 8 MAX SWING This is a clamp on the maximum swing of the Auto Trill sweep It runs 0 gt 63 A value of 63 will allow the effect to sweep the full range of pitch Bend ie 2 MIDI bytes worth or controller value ie 1 MIDI byte or up to a value of 127 A smaller value will allow proportionally less sweep One uses this parameter along with sensitivity parameters in the receiving synthesizer to adjust the full range of the Auto Trill effect This parameter will affect the range of Auto Trill exhibited by both the 4 Voice amp MIDI Output 9 MIN HOLD This item Minimum Hold allows one to impose a minimum key down requirement on Auto Trill operation It runs 0 255 and is calibrated in units of roughly 1 20 th of a second The action
22. three values AVCE OUT BOTH Each are described below 4VCE The Auto Bend will control only the 4 Voice pitch OUT The Auto Bend will control only the MIDI output as set through Item 11 above BOTH The Auto Bend will control both the 4 Voice and the MIDI output 13 INIT VAL This item runs from 0 through 127 and sets the baseline value of the MIDI controller selected through item 11 above if no MIDI controller has been selected this item has no effect The controller is set to this value when a key is hit the Interface is reset through front panel switches or MIDI commands or a new patch is 27 loaded One must beware with some synths however this controller value may be remembered by the synthesizer even after it is made to load other patches This can create problems especially with things like MIDI Volume which might be set differently after a patch with Auto Bend acting on it has been loaded 14 TRG KEY X This item allows one to select a note on the input MIDI controller to function as a trigger for the Auto Bend the action of this trigger depends on the setting of Item 10 above This item will run in value from 0 128 If it is set below 128 it specifies the MIDI note which will act as the trigger source If it is set at 128 no MIDI triggers will be produced in this fashion The KEY SAFE option of the MIDI MODE menu item 9 will require that the Soft pedal is depressed when the selected trigger key is hit i
23. transfer rate The 1 Mhz setting works for most gear that I ve used and is the default The serial port can be specified on which the MIDI interface resides through the top 2 items the modem port is the default rather than the printer port which can also be chosen When it is selected the last item clears all the Macintosh MIDI buffers If a load or save was aborted this option should be selected before attempting more such things so the Macintosh will continue with a clear slate 45
24. use an editing function Another important fact to keep in mind is that any altered patch values whether changed via the patch editor or MIDI controller command are saved to memory in the keypad save sequence outlined in Chapter 2 If one saves a patch that has been subject to controller commands that changed menu values the altered values will be saved with the patch The Interface accepts MIDI commands through all phases of its operation Regardless of the display amp menu status ie top level menu lower level menu editing etc the Interface will respond as commanded There is no discrete play mode that is invoked to handle MIDI The text below goes through all accepted MIDI commands one by one In some cases little detail is given because the action taken depends on patch menu settings which were exhaustively described in the preceding chapters Note ON OFF These commands play notes on the 4 Voice and or are selectively routed to the MIDI output The interpretation of Note commands depends heavily upon the setting of the MIDI Mode 4 Voice Setup and Set MIDI Out menus as described in the preceding chapters Note commands also trigger and resolve Auto Portamento Auto Bend amp Auto Trill effects Pitch Bend MIDI Pitch Bend commands are automatically sent to the 4 Voice Both bytes of the MIDI pitch bend message are used in the Interface a 12 bit pitch bend capability exists The pitch bend sensitivity is set through Item
25. use these controllers judiciously if the delay is active 24 9 The Auto Bend Menu The Auto Bend is a sweep effect Its output may be assigned to the 4 Voice pitch bend the 4 Voice VCF an arbitrary controller or pitch bend on the MIDI output and or the Tone Volume Balance processor The Auto Bend is triggered by MIDI commands sent to the basic Interface input channel as set by Item 1 in the MIDI Mode menu It can be triggered immediately at Note On with optional delay at Note Off with optional minimum hold requirements or via MIDI controller 82 General Controller 7 It can also be triggered by hitting a specified key subject to the Key Safe protection Two parameters determining the Auto Bend effect are velocity sensitive the direction of the bend up down and the rate of bend When the bend occurs on release of all notes the bend direction can be determined by the last note s attack or release velocity as set via Item 3 below while the bend rate is generally determined by the last release velocity When the bend is triggered on note attack or delayed note attack both parameters are determined by the attack velocity of the last note hit unless a note has been released before the bend starts in which case this release velocity will determine the bend rate and bend direction if set to RLS in Item 3 The allowed range of the bend effect can be limited through the Maximum Swing parameter in the menu below Item 7 Th
26. values ATK RLS RLS These are discussed independently below ATK This is the normal setting Notes will be sent to the MIDI output when Note on commands are received at the MIDI input addressed of course to the basic Interface input channel set under Item 1 of the MIDI MODE menu Delay can be introduced as discussed above under Item 8 RLS Notes will be sent to the MIDI output when they are released at the MIDI input The Delay Timer Item 8 above if active will now function as a minimum hold timer The attack and release velocities are preserved under this option ie the release velocity of each note will function as the release velocity at the MIDI output while the original attack velocity of the note will function as the attack velocity at the MIDI output RLS Notes will be sent to the MIDI output when they are released at the MIDI input The Delay Timer Item 8 above if active will now function as a minimum hold timer The attack and release velocities are reversed under this option ie the release velocity of each note now functions as the attack velocity at the MIDI output while the original attack velocity of the note will now function as the release velocity at the MIDI output 20 10 NOTE DUR This is the Note Duration parameter and it may be set between 0 and 255 It is active if a Note on Release ie RLS option was selected via the Note Trigger in Item 9 above The Note Duration specifies the bas
27. 27 Hitting a key harder will make the 4 Voice sound brighter when a sizable velocity sensitivity is selected All voices are affected here at once however the velocity with which a particular key is hit will also change the filter cutoff for all previously sounding voices The range of this effect is not changed by the VCF SWP setting on item 12 above 16 7 The Set MIDI Out Menu This menu allows one to specify the characteristics and operation of the MIDI output The Interface effectively operates as a MIDI merger and re channelizer inserting its own commands and modifying input MIDI commands for transmission to the output Most functions occur in parallel with 4 Voice operation the MIDI out can t operate completely independently there s always some correlation but the 4 Voice can be easily muted via Item 1 on the previous menu and the Interface effects amp functions can be used only on the MIDI output Each menu item is discussed independently below 1 OUT CHL This is the channel number assigned to the MIDI output device Internally generated commands are formed on this channel and the interpretation of incoming MIDI commands with respect to the MIDI output will depend upon this parameter according to the settings assigned to the items below The Output channel can be assigned identically to the basic input channel in the MIDI MODE menu but this might cause some confusion thus it is recommended that different channel numbers
28. 3 of the 4 Voice Setup Menu a range of roughly 1 5 octaves is possible No decrease in resolution of pitch bend is caused by specifying a smaller range the full 12 bits are always used Program Change Upon receipt of a program change command ranging from 0 through 98 the Interface will load the corresponding patch these range 1 99 in the display Before the new patch is loaded the 4 Voice MIDI output and various logic are cleared an action similar to hitting the Silence button When the Interface loads a patch through MIDI the new patch number amp title will be shown on the display regardless of the state of the patch editor This is merely a visual display one is not blown back to the top level editor which is cleared promptly after any keypad response The abrupt appearance of this display can be somewhat disconcerting while editing a patch item the cursor will continue flashing as in normal editing but the characters will be replaced by the patch number title Again this is only a phantom display and the original display re appears after any keypad key is hit Ideally one will not be editing a patch when MIDI program change commands are being sent thus this effect may be irrelevant Upon receipt of a program change command ranging from 100 115 the selected 4 Voice program is switched to the specified value minus 99 ie 4 Voice programs gt 16 34 are directly accessible The current Interface patch is o
29. Auto Trill page of another patch The data on other patch pages is unaffected One must be advised that these commands do not use the Macintosh clipboard as do the standard cut copy paste which are available at the top of the menu but use special internal storage thus the data can t be exported to the Scrapbook etc 44 The Up Downlink menu controls communication with the Interface over the MIDI line Uplink AII will load all 99 patches from the Interface into the Macintosh memory Uplink Patch will load a single patch the user is prompted to enter the patch to load in the Interface and specify where it will go in the Macintosh The Uplink Current Patch option will load the patch that is currently active in the Interface and has not necessarily been saved into the currently edited patch in the Macintosh The Downlink options are analogous Dounlink All loads the Interface with all 99 patches from the Macintosh Downlink Patch will download a single patch from the Macintosh to the Interface the user is prompted to enter the source and destination patch numbers Downlink Patch amp Load will downlink a single patch as above plus also load it as the currently active patch in the Interface If the Write Protect is set under the key on the Interface patches won t be able to be downloaded into the patch memory thus the patch editor will complain bitterly and the data transfer operation will be halted The option Downli
30. FF setting this can be changed via MIDI controller 65 9 VCF Sensitivity Undefined The value sent with MIDI controller 9 sets the range of the VCF sweep on controllers 1 or 3 or bend trill effects 12 Octave Switch Undefined The value sent with MIDI controller 12 shifts the 4 Voice oscillators up and down in octave intervals A value of 0 introduces no shift 1 shifts down by 2 octaves 2 shifts down by 1 octave and 3 or greater shifts up by one octave 13 Assign Mode Undefined The value sent with MIDI controller 13 changes the setting of the Assign switch on the 4 Voice keyboard module A value of 0 sets assign to R C a value of 1 sets assign to CONT a value of 2 sets assign to RESET and any value greater than 2 sets assign to CONT 16 Split Mode General Controller 1 The value sent with MIDI controller 16 is loaded into the split mode register The Split Mode runs 0 3 and corresponds to the values OFF 2 2 3 1 1 3 as described under Item 7 of the 4 Voice Setup Menu Any value exceeding 3 is assumed to be 1 ie 2 2 17 Unison Mode General Controller 2 The Unison is turned ON if the value sent with controller 17 is non zero or OFF if zero 18 Reassign Mode General Controller 3 The Reassign is turned ON if the value sent with controller 18 is non zero or OFF if zero 65 Portamento Mode Portamento On Off The value sent with MIDI controller 65 is loaded into th
31. It then logically takes two possibilities STEREO MONO The mono bridging is handy if one is using panning effects 10 ST ENHCE This parameter specifies the selection of a stereo enhance effect It may be turned ON or OFF When on a very noticeable left right separation enhancement appears along with a small rise in volume 11 LD CMP This is a standard loudness compensation effect as on a home stereo When ON a signal set to low volume via item 1 and associated controllers will be boosted in both bass and treble The effect diminishes as the volume setting increases 33 12 MIDI Implementation The MIDI implementation adopted by the 4 Voice Interface is quite thorough MIDI commands interpreted by the Interface are addressed to the basic MIDI channel as set via Item 1 of the MIDI Mode menu barring any generalities allowed via the OMNI setting ie Item 2 of the MIDI Mode menu Certain MIDI controller commands can change patch menu values ie most settings in the 4 Voice Set up menu certain items in the MIDI Mode menu and the Auto Bend Auto Trill and Auto Portamento enable flags are all alterable under MIDI commands The values displayed by the patch editor will also change accordingly This will not happen instantaneously however if the patch editor is displaying the item being changed via MIDI it will not show the new value unless the display is refreshed ie display another menu item then go back to the original or
32. OBERHEIM 4 VOICE MIDI INTERFACE Users Manual Updated 11 90 Updated 9 91 Joe Paradiso MIT Media Lab E15 351 Cambridge MA 02139 617 253 8988 16 15 souno OBERHEIM 4 VOICE MIDI INTERFACE Users Manual Table OF Contents 1 Conligurati n 5 WEES TS WORE SHOES RSs ORES AKERS ORGAN OREO ROWS 1 2 Interface Operation and Key Button Functions 4 3 Fundamentals of Patch Editing eee eee eene 8 4 Editing the Patch 10 5 The MIDI Mode Menu ccccccccccccccccccccccccccccsscccccsece 11 6 The 4 Voice Set Up Me ntlyisisccsccccccsscchocssscavvesssenevecviecaveeses 15 7 The Set MIDI Out Menu ic Ses rex os erri ERR REX SEXO RR RR 17 8 The Auto Portamento 23 9 The Auto Bend 5 555555 25 10 The Auto Trill Ihn 29 11 The Tone Volume Balance Menu ccccccccccccccccccccccccecs 33 12 MIDI Iniplementatloli vcecosexecexvvsRiXecv5ruvxeXr es Ee oe REC EET ER 34 13 System Exclusive Commands eeeeeee eene 42 14 Patch Editor Librarian Program e ee eee eee eene nnne 44 OBERHEIM 4 VOICE MIDI INTERFACE Users Manual J Paradise jacp edia mit edu 1 Configuration This device controls the Oberheim 4 V
33. This feature can be used to externally inject a bend voltage or filter voltage into the 4 Voice as with the alternate cable mentioned above or to mute the bend filter entirely use an unconnected 4 jack to disengage the bend filter feed The 4 jacks added to the 4 Voice bend filter inputs are actually a 3 connector balanced jacks while the 14 jacks on the rear of the Interface bend filter outputs are 2 connector unbalanced jacks For the most part this doesn t matter a standard unbalanced guitar cord should be adequate to connect between 4 Voice and Interface In all tests however the connections through the DIN cable seemed to work fine so these additional cables will probably not be needed When the DIN cable is not connected between the 4 Voice and Interface the supervisory logic added to the 4 Voice is held in a reset mode This enables the 4 Voice to work as it always has the additional logic supervising its operation will have no effect Upon power up or whenever the button added to the 4 Voice front panel is depressed the 4 Voice supervisory logic will also be reset If the 4 Voice has received a valid command from the Interface unit other than a reset the red LED added to the 4 Voice next to the reset button will be illuminated This indicates that the 4 Voice may be in a commanded mode any switch changes on the programmer or keyboard control modules may have unpredictable effect If one desires to work directly wi
34. ands or a new patch is loaded One must beware with some synths however this controller value may be 3l remembered by the synthesizer even after it is made to load other patches This can create problems especially with things like MIDI Volume which might be set differently after a patch with Auto Trill acting on it has been loaded 14 TRG KEY X This item allows to select a note on the input MIDI controller to function as a trigger for the Auto Trill the action of this trigger depends on the setting of Item 10 above This item will run in value from 0 128 If it is set below 128 it specifies the MIDI note which will act as the trigger source If it is set at 128 no MIDI triggers will be produced in this fashion The KEY SAFE option of the MIDI MODE menu item 9 will require that the Soft pedal is depressed when the selected trigger key is hit in order to produce a valid trigger event 15 VCF FEED This item specifies the amount of Auto Trill feed into the 4 Voice VCF the amount of effect is also subject to the VCF SWP setting in the 4 Voice Setup Menu It runs 0 no effect through 255 16 VOL FEED This item specifies the amount of Auto Trill feed into the volume control of the on board audio processor It runs 0 no effect through 255 This option can be used to generate keyboard driven tremolo effects 17 BAL FEED This item specifies the amount of Auto Trill feed into the balance control of the on board audio pr
35. are used 2 XMIT M This command sets the Transmit Mode It sets the way in which the Interface will relay MIDI commands arriving at its input Four values are possible OFF ONLY RECHN ALL These values can cause filtering or modification of incoming MIDI commands before passing them on to the MIDI output The Interface will always directly relay any Program Change Real Time System Exclusive or System Common messages arriving at the MIDI input regardless of the setting on this or any other menu option The action otherwise occurring under the set of values listed above is independently discussed below OFF No incoming MIDI data is relayed to the MIDI output except for the subset of moding commands listed above The Interface of course still can send its own commands to the MIDI output depending on the chosen Send Mode as set in Item 3 below ONLY Incoming MIDI commands are relayed only if they arrive on the channel assigned under Item 1 above All such MIDI commands are relayed intact ie note commands controllers pitch bend etc Any MIDI commands assigned to a different channel are filtered out unless they are in one of the categories that are always passed on as listed above RECHN This functions like ONLY above ie MIDI commands assigned to the output channel are relayed The difference however is that any non note MIDI commands arriving under the Interface basic channel set in the MIDI MODE menu are now re channel
36. ate voices in a particular order leftmost first 10 OCTAVE This item transposes the 4 Voice oscillators up and down by octave intervals A range of 2 octaves down and 1 octave up can be specified The settings are 0 2 1 1 11 VCF BASE This item controls the base frequency of the 4 Voice VCF s It is analogous to the VCF knob on the keyboard control module This setting ranges from 0 through 255 and can produce a very wide effect settings near zero bring the filter cutoff down so low that little audio can be heard leaking through 12 VCF SWP This specifies the range of the 4 Voice response to MIDI VCF commands and Auto Bend Trill effects routed to the 4 Voice VCF It runs between 0 and 255 and is essentially uncalibrated full scale produces an extremely wide sweep however The Interface always uses a full 8 bits for VCF commands 7 bits with a MIDI controller these bits of data are used to span a VCF frequency interval that is set through this item 13 VCF CTLR This item specifies which MIDI controller will command the VCF cutoff frequency It has two settings MOD 3 MOD selects the modulation wheel MIDI controller 1 thus the VCF cutoff can be swept by moving the mod wheel 3 selects MIDI controller 3 for the VCF cutoff useful in cases where the modulation wheel is reserved for other purposes 14 VCF VEL This item sets the key velocity sensitivity of the VCF cutoff It ranges from 0 no effect through 1
37. d an external MIDI switch controller Their performance is velocity sensitive and their effect can be applied to the 4 Voice the MIDI output pitch bend and or any MIDI output controller and the onboard audio processor The Auto Bend is a simple sweep effect while the Auto Trill is an adjustable pulse wave triangle or sweep modulation effect Auto Bend and Auto Trill can both be active simultaneously and sent to the same or different MIDI destinations ie they can both be assigned to pitch bend one to pitch bend and one to any controller both to different controllers or both to the same controller They can also be assigned to the 4 Voice pitch 4 Voice filter and the audio processor s volume bass treble and balance functions Item 7 enables one to configure the basic operation of the audio processor Its base parameters can be set and their response to MIDI note velocity specified The next chapters will describe the functions of the submenus and procedures associated with each of the 8 top level items listed above It must be remembered that although that any edits performed to the resident patch immediately affect the operation of the Interface and 4 Voice none of this data 1s saved and will be lost when the Interface is powered down or another patch is loaded The key must be used to save any patch changes as was discussed at length in the previous section 4 Editing the Patch Number Title To change the patch number
38. dit the individual characters as described below Pressing Cancel will restore the original patch title and abort the title edit the patch number will start flashing and can again be edited Pressing the red C key when the entire title is flashing will clear all patch characters this may be useful when creating a totally different title Again the Cancel button is an Undo function which will restore the original title in the event of a mistake If K is hit again only the first patch character will flash This character can then be changed via the and keys Holding down either of these keys will cause the display to auto increment or auto decrement through all possible letters numbers and symbols One can also hit the red C key to promptly clear the character Hitting K again will advance to the next character in the title which can be edited in a similar fashion By repeatedly hitting K one can step through all nine characters in the patch title if K is struck on the last character the first character will begin flashing and can again be edited Hitting Enter will latch the modified title into the current patch and stop the editing process Hitting Cancel will restore the original character If Cancel is hit twice in succession the original patch title will be restored regardless of any changes made and all characters will flash allowing any of the options described above to be repeated 10 5 The
39. domize the buffer playback 22 8 The Auto Portamento Menu The Auto Portamento effect is a touch sensitive portamento option for the 4 Voice synthesizer and or the MIDI output this effect can be quite fun to play with on other synthesizers Under Auto Portamento the glissando of each note can be made to depend on the note s attack velocity The 4 Voice action of the Auto Portamento will depend on the setting of Item 4 of the 4 Voice Setup Menu the Portamento Mode If this is set either OFF or BTH the Auto Portamento will always occur in both keyboard halves If Split is on and the Portamento mode specifies a portamento split then the Auto Portamento will only be active in the specified keyboard half The Auto Portamento when active overrides any Portamento Time settings Item 5 in the 4 Voice Setup Menu although this should be left at zero so portamento will stop when amp if Auto Portamento is turned OFF A Note on delay can also be imposed on the 4 Voice in this menu this may have independent musical applications All menu items are discussed in detail below 1 AUTO PRT This item allows the Auto Portamento to be turned ON or OFF When ON an asterisk will appear in the right hand corner of the display when the AUTO PMNTO entry is displayed at the top level menu and the Auto Portamento effect will function as configured in this menu Auto Portamento must be turned ON for the delay feature to work although it may be us
40. e 4 Voice supervisory logic After depressing C the message C TO CLR 4 V will appear on the display If C is hit again the 4 Voice will be reset this accomplishes the same function as hitting the black button added to the 4 Voice panel and a confirmation message is displayed which is cleared after hitting any key If any other key is pressed the operation is aborted This function is unavailable when in a lower level menu If one hits C while editing an item the quantity is set to its lowest allowable value or potential OFF state when editing a character list K Key K This Key generally means Go to the lower level menu or Edit this quantity Assuming one is at the top level menu hitting K at the patch title display will cause it to be edited as described below while hitting K at a sub menu title will cause one to enter the lower level scroll for that sub menu If one is in a lower level menu hitting K will allow the displayed value to be changed ie the cursor will flash over the value and it can be changed by any of the methods described above If the quantity is non numeric ie it is a list of character options one can hold K down or hit K repeatedly to scroll through the list of values this can also be done with the key although keeping one s finger on K may be more convenient The opposite of K is the Cancel button this will abort the edit operation and restore the original value unchang
41. e Sweep Bias set under Item 6 this parameter actually sets the clocking rate while the Sweep Bias sets the bend increment per sweep update It seems best to keep this at very low values otherwise the sweep is very slow A quantized stepping effect might be obtained by making the Sweep Bias Item 6 and the Rate Set values both fairly large this can result in large pitch or controller steps being taken at discretely spaced intervals producing an ascending or descending staircase effect The Rate Set value is calibrated in units of roughly 1 300 th of a second 9 MIN HOLD This item Minimum Hold allows one to impose a minimum key down requirement on Auto Bend operation It runs 0 255 and is calibrated in units of roughly 1 20 th of a second The action taken under this setting is heavily dependent upon the setting of the Trigger Source Item 10 below Details are given with the Trigger Source description The zero value of Minimum Hold is replaced with the characters RLS since a zero Hold value will cause the Auto Bend to trigger on last note release if the Trigger Mode is set to NRM Note that the T LED to the right of the display will be illuminated while the minimum hold delay is active this might be useful in setting up patches but beware since delays in Auto Trill and the MIDI output can illuminate this LED as well 10 TRIGGER This allows one to select a Triggering protocol for the Auto Bend effect It can take three
42. e duration of the notes that are triggered on release It is in units of roughly 1 20 th of a second A velocity increment can be added to this quantity as detailed in Item 11 below The note duration will begin timing after all keys have been released All sounding notes will be cleared when either the note duration timer finishes or when another note on is received at the MIDI input This item has no effect if notes are sent upon attack ie the ATK option in Item 9 11 DUR VSCL This parameter applies a velocity sensitive increment to the Note Duration defined above in Item 10 It may be set between 0 63 If zero there is no velocity sensitivity and the duration of released note on s is solely determined by the setting of Item 10 As it is increased velocity sensitivity is added to the value set in Item 10 The velocity sensitivity is defined such that a slow key release will yield a longer note duration than a quick key release this protocol seems to be more intuitive than its opposite The release velocity of the ast note held down is used here since the duration timer begins counting only after all notes have been released 12 REC KEY This parameter sets the input stimulus that starts recording the input notes for the internal note buffer It ranges 0 129 The 0 setting is replaced by the characters SOS in the display This setting selects the Sostenuto pedal MIDI controller 66 to be the record trigger i e the note buffe
43. e in handy if one needs to quickly re load the 4 Voice ie if it has suffered a power loss or has otherwise been disturbed Notes are not turned off the Silence button can be used for this If one is in a lower level menu this function is not available The X key will now cause the display to show the top level item which is currently being edited This may be useful in refreshing one s memory as to which lower level menu is under inspection ie the lower level items under Auto Bend and Auto Trill can appear quite similar some confusion is possible Divide Key When at the top level menu hitting the key will allow the write protect option to be enabled and disabled Upon depressing the write protect status is displayed with cursor flashing This is either Y or N If it is set to Y the write protect is active and patch data can not be saved either through the key scenario sketched above or via system exclusive commands If it is N data can be freely written into patch storage via either method One can use the or C keys to edit this value Hitting enter sets the write protect flag to its displayed value If one is in a lower level menu this function is not available The key will now cause the display to flash the current patch number and title This may again be useful to combat cases of forgetfulness en Clear Key C When at the top level menu hitting the C key will allow one to reset th
44. e net effect of pitch bending on the 4 Voice is also dependent upon the Pitch Bend Sensitivity setting Item 3 in the 4 Voice Set up Menu as the VCF range is dependent on the VCF SWP setting After the Bend is complete the swept parameters ie 4 Voice pitch VCF MIDI pitch bend MIDI controller Tone Volume Balance remain at their extreme values until either a new note is hit a new patch is loaded or the Interface is reset via the Silence button or other procedures Each item in the Auto Bend menu is described in detail below 1 AUTO BND This is the switch to turn the Auto Bend effect ON or OFF When OFF the other items in this menu will have no effect When ON an asterisk appears at right in the AUTO BEND item of the top level menu and the Auto Bend will operate as configured The Auto Bend may also be enabled and disabled via MIDI controller 80 General Purpose Controller 5 this may be useful in sequencer situations where the bend effect is to be dynamically turned on and off in a composition note that another MIDI controller can be used to trigger the bend effect as detailed under Item 10 below 2 BEND DIR This quantity determines the velocity sensitivity of the bend up or bend down switch It runs 0 127 A large value of this parameter will favor bend up ie a very small velocity will be needed to bend down while a small value of this parameter will favor bend down ie a very fast velocity will be needed to bend up
45. e portamento mode register The allowed values run 0 3 and correspond to OFF BTH UPR LWR as described under Item 4 of the 4 Voice Setup Menu Any value exceeding 3 is assumed to be 1 ie BTH No change will be heard immediately if the portamento time is zero this can be dynamically adjusted via MIDI controller 5 36 94 Pitch Bend Sensitivity Celeste Detune Depth The value sent with MIDI controller 94 is loaded into the sensitivity register for the 4 Voice pitch bend This is allowed to range 0 127 ie the full MIDI resolution The full range is covered however one unit sent via the MIDI controller is equal to 2 units changed by the patch editor which allows this parameter to range 0 255 The controllers listed below change parameters in the Audio Processor i e set by the Tone Volume Balance menu They are incorporated to allow a dynamic change in Audio parameters without the necessity of loading an entirely new patch This may be quite useful in sequencer operation amp performance i e where a parameter is swept on a continuous controller and can save on needed patch locations Beware since these commands actually change the settings in the Tone Volume Balance menu saving a patch after it has been altered will save the controller commanded values The Official MIDI name of each controller is given to the right of each heading in parenthesis 4 Treble Foot Switch The value sent with MIDI control
46. e these commands actually change the settings in the corresponding menus saving a patch after it has been altered will save the controller commanded values 19 Auto Portamento Enable General Controller 4 The value sent with MIDI controller 19 will turn the Auto Portamento effect ON or OFF A zero value turns it OFF while any non zero value turns it ON 80 Auto Bend Enable General Controller 5 The value sent with MIDI controller 80 will turn the Auto Bend effect ON or OFF A zero value turns it OFF while any non zero value turns it ON This controller does not actually trigger the effect see controller 82 81 Auto Trill Enable General Controller 6 The value sent with MIDI controller 81 will turn the Auto Trill effect ON or OFF A zero value turns it OFF while any non zero value turns it ON This controller does not actually trigger the effect see controller 82 20 Trill Frequency Undefined The value sent with MIDI controller 20 basically sets the RTE BIAS parameter 7 of the Auto Trill menu This allows one to dynamically alter the trill frequency during a trill 21 Trill Pulse Width Undefined The value sent with MIDI controller 21 basically sets the TRL WIDTH parameter 20 of the Auto Trill menu This allows one to dynamically alter the pulse width or waveform asymmetry during a trill although the trill rate will also be somewhat affected A value of zero creates a symmetric waveform
47. ed or if scrolling through a lower level menu bump up to the top level menu The K key takes on additional significance when editing a patch number amp title as detailed in Chapter 4 3 Fundamentals of Patch Editing Upon power up the Interface loads the last patch either saved or accessed The display will show the patch number and patch title and place the patch editing software at the top level menu This menu contains 8 entries that correspond to different aspects of Interface function Each of these entries is a title for a submenu that contains several specific quantities that can be changed to specify Interface performance One can scroll through the top level menu by repeatedly pressing the key or Enter key forward scroll or key backward scroll Cancel will always return the display to the patch number title The 8 items in the top level menu are 1 Patch Patch Title 2 MIDI MODE 3 4 VCE SET UP 4 SET MIDI OUT 5 AUTO PMNTO 6 AUTO PBEND 7 AUTO TRILL 8 TONE VOL BAL This list as with all menu lists is scrolled in a circular fashion ie the display will step from item 8 to item 1 on a forward scroll or item 1 to item 8 on a backward scroll In order to inspect and or edit the submenu and parameters associated with any of these categories one scrolls the display to the heading desired and presses the K key The editor will then enter the appropriate submenu or start editing the patch title i
48. ed independently by setting AFFECT to OFF in Item 4 below Auto Portamento may also be turned ON amp OFF through MIDI controller 19 which is designated General Purpose Controller 4 2 AVEL SCL This item allows the attack velocity sensitivity to be set for the Auto Portamento effect It ranges from zero no effect through 255 maximum 3 AVEL SNCE _ This item specifies how the Portamento effect will vary with attack velocity It may take two values If the glissando effect is diminished for notes that are hit hard If the glissando effect is increased for notes that are hit hard 4 AFFECT This item specifies which synthesizer combination is affected by the Auto Portamento It takes 4 possibilities AVCE OUT BOTH OFF 4VCE is the 4 Voice only OUT is the MIDI output BOTH is both and OFF produces no Auto Portamento effect although the Delay effect can still be used see below 5 DELAY This item specifies a delay which is applied before each note is sent to the 4 Voice and MIDI output It ranges from 0 63 and is calibrated in units of roughly 1 75 th of a second Auto Portamento must be ON via Item 1 above or MIDI controller 19 for the delay to operate This delay feature was initially introduced to compensate any lag in the 4 Voice portamento hardware ie if the portamento responded slowly one would want to wait a bit in between assigning the portamento value and sending the note command As it turn
49. ed out this was unnecessary The 4 Voice portamento circuitry works very rapidly and Auto Portamento will function perfectly with this Delay set to zero ie off If a nonzero delay is inserted however weird and fun things will happen with note timing The delay will be obvious and a rapid stream of input notes ie from hitting a quick chord will be flammed into a series of individual notes separated identically by the delay interval If one goes wild and rapidly plays a series of notes chords the Interface will slowly methodically play each note out at constant tempo set by the delay interval This creates a neat delay effect where the results of one s 29 playing are stretched into a sequence that continues well after the playing is finished The notes sent to the MIDI output are also delayed and staggered with the 4 Voice notes i e a 4 Voice note sounds first followed by an output note followed by another 4 Voice note etc One word of caution applies however when the Interface is waiting for this delay to expire it is not servicing its MIDI buffer or doing much of anything else Incoming MIDI data can fill this buffer up in foreground and if a large delay setting slows down its servicing a MIDI overflow can result Things are really not too bad the MIDI buffer available in the Interface is fairly huge and it s mainly things like pitch bend or mod wheel commands that could have any chance of clogging it significantly
50. eful if the 4 Voice is to follow a polyphonic input stream it can be set to follow only the top bottom first or last note as defined in the key priority Any unsounded notes can be routed to the MIDI output through the Send Overflow option in the SET MIDI OUT menu The Interface unit can also be used to put any other MIDI synthesizer into a prioritized mono mode through this option if the Mono mode is set on and the Echo 4 Voice output mode is active in the SET MIDI OUT menu the synth connected to the MIDI output will follow the monophonic 4 Voice response detailed above Note that this Mono mode is independent of any settings in the 4 Voice hardware Unison Split Mode etc must be commanded separately The Mono mode does not know about the split point only one note will be allowed to be down over the entire 4 Voice range regardless of the keyboard half in which it resides 4 KEY PRTY This item allows a software key priority to be imposed on any notes that are simultaneously held down Its allowed values are OFF HI LOW FST LST This option knows about the 4 Voice hardware settings ie Split Mode amp Unison made in the 4 VCE SET UP menu but it doesn t know anything about actual switch settings on the 4 Voice itself and assumes the 4 Voice has been entirely moded through this menu thus directly accounts for the number of voices available in any keyboard half when Split is activated It also knows about the MONO mode described ab
51. erated for the MIDI output are processed by the delay and filtering items specified elsewhere in this menu before being actually sent out Each option available to the SEND command is independently discussed below MUTE No note commands are generated by the Interface for transmission through the MIDI output The Interface will as always still relay incoming MIDI data according to the setting of the XMIT Mode command discussed above Notice that this command only refers to generated note data the pitch bend and or controller data created through Auto Bend and Auto Trill are unaffected by this setting NORMAL All note commands arriving on the basic input channel are sent to the output channel subject of course to the conditions selected in the other items of this menu ECHO4V This stands for Echo 4 Voice which essentially describes the action taken All notes sent to the 4 Voice are also sent to the output channel This allows one to have a slave synthesizer duplicate what the 4 Voice is playing provided that a Key Priority and or Mono Mode is selected in the MIDI Mode menu otherwise the action will be identical to NORMAL above except that notes falling outside the 4 Voice range will be ignored The Transpose set in Item 6 of the MIDI mode menu is not subtracted from the note number thus the incoming MIDI notes are transferred intact OVFLOW Only 4 Voice overflow notes ie notes sent but not sounding are sent to the MIDI out
52. f the display was on item 1 which can also be scrolled through and inspected via the Enter and keys If one desires to modify any value displayed again hit the cursor will flash over the current value and it can be changed via the methods described in the last section Pressing cancel will return the display to the top level menu and another above listed category can be selected pressing cancel while actually editing however will abort the edit and restore the original parameter value Items 2 through 4 on the top level menu specify the operation of the Interface and 4 Voice Item 2 allows one to set the MIDI input characteristics and specify the way in which the 4 Voice will respond to incoming commands Item 3 is essentially a remote control on the 4 Voice keyboard and programmer modules the 4 Voice can be entirely re moded from this menu Item 4 dictates the way in which the MIDI output will operate and how it will correlate with commands sent to the 4 Voice The next 3 items are effects which can be sent to 4 Voice and or MIDI output If any of these effects are enabled a will be illuminated in the rightmost character of the corresponding display if the is not present in the top level menu listing the effect 15 deactivated Item 4 is a velocity sensitive portamento effect which can only be used with the 4 Voice Items 5 and 6 are sweep effects that can be triggered via note on delayed note on note off an
53. he MIDI output if the Send Overflow option has been selected in the SET MIDI OUT menu 7 AUTOCRD This item may be turned ON or OFF Its original intent was to cut off decaying notes sounding on the 4 Voice whenever a new note on was received It does do this but its best application is as an independent effect it plays a chord on the 4 Voice whenever a new key is hit The chord is determined by Item 8 INTERVAL below It can be set by the user i e played on the keyboard recalled from a previous setting each patch has a programmable chord assigned to it which is saved with the patch or set to a default OCT under the INTERVAL item below If OCT is selected this effect sounds kind of like a polyphonic slapback Unison with Reassign on Assign set to Cont and Split Mode off or gives more of a fat Moogish sound with Reassign off Assign not set to Cont or Split Mode on Upon receipt of a new note on Autocrd will send rapid key pulses to the 4 Voice to briefly allocate all free voices If Reassign is on in the 4 VCE SET UP menu the incoming note is used to allocate all voices rapid key down and key up commands are sequentially sent as if one hit the note several times in succession The delay between notes can be noticed giving kind of a slap back effect If Reassign is off or Split is on which turns the Reassign off by default in the 4 Voice hardware the same note can not be sent sequentially as above othe
54. ill waveform triangle pulse sweep and pulse width or wave asymmetry may be user specified or set dynamically through MIDI controllers Each item in the Auto Trill menu is described in detail below 1 AUTO TRL This is the switch to turn the Auto Trill effect ON or OFF When OFF the other items in this menu will have no effect When ON an asterisk appears at right in the AUTO TRILL item of the top level menu and the Auto Trill will operate as configured The Auto Trill may also be enabled and disabled via MIDI controller 81 General Purpose Controller 6 this may be useful in sequencer situations where the Trill effect is to be dynamically turned on and off in a composition note that another MIDI controller can be used to trigger the Trill effect as detailed under Item 10 below 2 AVEL SCL This quantity determines the velocity sensitivity of the Trilling rate It runs 0 127 A large value of this parameter will favor a rapid Trill while a small value will favor a slower Trill Trilling rate has a different effect on a MIDI controller unless both Auto Bend amp Auto Trill are active over the same channel since as mentioned above the Trill effect will generally be a simple sweep over a Controller A faster trilling rate in this case will cause a faster sweep 3 AVEL SNCE _ This item selects the sense of the velocity scaling on the Trilling rate It can be set either If larger velocities will generate a faster Tri
55. ill overwrite in the Macintosh memory this can be any of the 99 possible patches After again hitting return the window will be redrawn with the patch titles in Macintosh memory but now the newly loaded patch is seen to be resident wiping out what was there before This option affords a handy way to steal separate patches from various files and combine them into another file or Interface load The Save option will write the patches resident in Macintosh memory into a data file the user is prompted to specify a filename then the patches are written out Quit will stop the program and exit to the Finder The top items in the Edit menu function as they always do for individual character strings but may be of limited utility in the Librarian program The two lower groups of items are of more interest The Copy Patch and Paste Patch options allow one to copy the current patch to transient storage then paste it into another file if new data was loaded or into another patch if the current patch number was changed thereby juggling patch order around The Copy Page and Paste Page commands work at a finer level They are only available when editing an Interface menu page as will be outlined below All data from the current page is copied into transient storage and can be pasted into the analogous page of a different patch This allows one to take a certain setup on part of a patch i e the Auto Trill effect and paste it into the
56. in the Auto Bend Menu 83 Auto Trill Trigger General Controller 8 A non zero value associated with MIDI controller 83 will trigger the Auto Trill effect A zero value of controller 83 will have no effect The interpretation of this command depends Aeavily on the settings of the Minimum Hold and Trigger Source Items 9 and 10 configured in the Auto Trill Menu The following items are all Channel Mode messages They can change the protocol under which the Interface receives MIDI messages ie the OMNI flag can be altered thus should be used with caution All of these commands will cause the Interface to clear all notes pitch bend software flags etc analogous to the Silence button The MIDI channel sent with these commands must agree exactly with the basic input channel set in the MIDI Mode menu regardless of the OMNI value If the channel is different the command is ignored Again these options are incorporated to allow a dynamic change in the Interface configuration and operation without the necessity of loading an entirely new patch This might be useful in sequencer operation and can save on needed patch locations Beware since these commands actually change settings in the MIDI Mode menu saving a patch after it has been altered will save the controller commanded value 124 Set OMNI OFF The OMNI parameter Item 2 of the MIDI Mode Menu is set to OFF subsequent MIDI commands must be issued over the assigned ba
57. ized to possess the output channel number set in Item 1 above and also relayed to the MIDI output All other MIDI data except for the special categories as well as MIDI note data arriving on the basic MIDI channel are filtered out Program change data is not re channelized but passed intact since it is in one of the aforementioned special categories The RECHN option may be useful when a synthesizer on the MIDI output is used as a slave that augments the 4 Voice operation any controller pitch bend etc data that is sent to the 4 Voice will also be sent to the output channel ie these commands do not have to be 17 duplicated The slave synth is still independently accessible through its own channel number any commands sent under the output channel will be relayed intact without any Interface effect ALL incoming MIDI data is relayed directly to the MIDI output with no modification except perhaps pitch bend which can be independently filtered via the Xmit PB command discussed in Item 4 below This mode might be useful if several synthesizers or a big multi timbral job are listening to the MIDI output for data unrelated to Interface operation this isn t really needed however since the Interface also provides a MIDI thru connector 3 SEND This item allows one to specify the types of MIDI note commands generated by the Interface unit It accepts four values MUTE NORMAL ECHO4V OVFLOW All note commands gen
58. izer A number can be entered into this parameter ranging up to 64 which will activate the output Fill mode and specify the number of voices available in the output synthesizer The Fill mode is an option that will allocate all available voices in the output synthesizer whenever a new note on is sent Its function is mainly to mute any sustained tones in the output synth whenever a note is changed allowing the slave synthesizer to directly follow what the 4 Voice is playing If the ECHO4V mode is selected under the Send item 3 in this menu the Fill logic will assume that the output Synth should normally have 4 Voices available or only one if Mono mode or Unison are selected The remaining voices will be rapidly allocated amp de allocated to mute excess sustaining tones when notes are changed If ECHO4V is not selected under the Send item the Fill logic will reallocate a free voices whenever a note is turned on thereby always cutting off any sustains One will have to experiment with this capability in order to ascertain its utility and learn how to use it effectively In order to avoid having the wrong notes cut off especially in the ECHO4V mode where an attempt is made to exactly follow the 4 Voice one should slur one s playing somewhat and not let up old keys until the new keys are down In addition the way in which various synthesizers respond to the rapid note on s amp note off s sent under this option will vary The up
59. key was released prior to the start of the bend 5 RVEL SNCE _ This item selects the sense of the velocity scaling on the bend rate It can be set either If larger velocities will generate a faster bend rate while if smaller velocities will generate a faster bend rate 6 SWP BIAS This item allows one to specify a Sweep Bias It runs 0 255 This is essentially a base sweep bias for the Auto Bend effect the velocity increment specified under Items 4 amp 5 is added to this to generate the net Auto Bend sweep A low Sweep Bias value ie 0 or so will exhibit extreme velocity sensitivity provided that the Rvel Scale in Item 4 is set sufficiently large A higher value of Sweep Bias will show less velocity sensitivity and exhibit faster sweeps 7 MAX SWING This isa clamp on the maximum swing of the Auto Bend sweep It runs 0 63 A value of 63 will allow the effect to sweep the full range of pitch bend ie 2 MIDI bytes worth or controller value ie 1 MIDI byte or up to a value of 127 A smaller value will allow proportionally less sweep One uses this parameter along with sensitivity parameters in the receiving synthesizer to adjust the full range of the Auto Bend effect This parameter will affect the range of Auto Bend exhibited by both the 4 Voice amp MIDI Output 8 RATE SET This is yet another parameter that specifies the base rate of the Auto Bend It runs 0 254 and is somewhat similar in effect to th
60. ler 4 adjusts the Treble level on the audio processor 7 Volume Volume The value sent with MIDI controller 7 adjusts the Volume level on the audio processor 8 Balance Balance The value sent with MIDI controller 8 adjusts the Left Right channel balance on the audio processor 11 Bass Expression The value sent with MIDI controller 11 adjusts the Bass level on the audio processor 24 Loudness Compensation Undefined The value sent with MIDI controller 24 activates deactivates the loudness compensation on the audio processor A value of 0 turns loudness off while any other value turns it on 25 Stereo Mono Input Select Undefined The value sent with MIDI controller 25 sets the inputs of the audio processor to be either stereo or bridged to mono A value of 0 selects stereo while any other value chooses mono 37 26 Stereo Enhance Undefined The value sent with MIDI controller 26 activates deactivates the stereo enhance effect on the audio processor A value of 0 turns the enhance off while any other value turns it on The controllers listed below allow one to dynamically enable disable amp alter several of the Interface effects Again these options are incorporated to allow a dynamic change in the Interface configuration and operation without the necessity of loading an entirely new patch This may be quite useful in sequencer operation and can save on needed patch locations Beware sinc
61. ll rate while if smaller velocities will generate a faster Trill rate 4 RVEL SCL This item determines the velocity scaling on the growth of the Auto Trill effect It ranges from 0 gt 127 Values near zero will exhibit very little velocity scaling while larger values will cause the trill to grow much more rapidly depending upon the velocity value Whenever the Auto Trill is triggered on note release the rate scaling is determined by the release velocity of the last key let up Otherwise the rate scaling is 29 determined by the attack velocity of the last key hit unless a key was released prior to the start of the Trill 5 RVEL SNCE This item selects the sense of the velocity scaling on the Trill growth It can be set either If larger velocities will generate a faster Trill growth while if smaller velocities will generate a faster Trill growth 6 SWP BIAS This item allows one to specify a Sweep Bias It runs 0 255 This is essentially a base sweep bias for the Auto Trill effect the velocity increment specified under Items 4 amp 5 is added to this to generate the net Auto Trill sweep by sweep here we mean the increment in trill magnitude at each pitch change thus this correlates with the trill growth A low Sweep Bias value ie 0 or so will exhibit slower trill growth and extreme velocity sensitivity provided that the Rvel Scale in Item 4 is set sufficiently large A higher value of Sweep Bias will
62. ms in the 4 Voice Setup menu They are incorporated to allow a dynamic change in 4 Voice configuration and operation without the necessity of loading an entirely new patch This may be quite useful in sequencer operation and can save on needed patch locations The VCF sweeps can be useful in performance Beware since these commands actually change the settings in the 4 Voice Setup menu saving a patch after it has been altered will save the controller commanded values The Official MIDI name of each controller is given to the right of each heading in parenthesis 1 VCF Cutoff Frequency Modulation Wheel 3 VCF Cutoff Frequency Undefined The VCF cutoff frequency may be set via either of these controllers depending on the setting of the VCF CTLR item in the 4 Voice Setup Menu If the controller is chosen to be MOD the modulation wheel controller 1 will adjust the filter cutoff If the controller is chosen to be 3 the modulation wheel will have no effect and controller 3 will adjust the filter cutoff The range of filter sweep is set by the VCF Sensitivity adjustment which can be changed in the 4 Voice Setup Menu Item 12 or through MIDI controller 9 35 5 Portamento Time Portamento Time The value sent with MIDI controller 5 is loaded into the portamento time register which runs 0 63 larger values are saturated at 63 This will not have immediate effect in the 4 Voice if the portamento mode is in the O
63. n order to produce a valid trigger event 15 VCF FEED This item specifies the amount of Auto Bend feed into the 4 Voice VCF the amount of effect is also subject to the VCF SWP setting in the 4 Voice Setup Menu It runs 0 no effect through 255 16 VOL FEED This item specifies the amount of Auto Bend feed into the volume control of the on board audio processor It runs 0 no effect through 255 This option can be used to generate keyboard driven volume sweeps 17 BAL FEED This item specifies the amount of Auto Bend feed into the balance control of the on board audio processor It runs 0 no effect through 255 This option can be used to generate keyboard driven dynamic panning effects 18 BAS FEED This item specifies the amount of Auto Bend feed into the bass control of the on board audio processor It runs 0 no effect through 255 This option can be used to generate keyboard driven bass swells 19 TRB FEED This item specifies the amount of Auto Bend feed into the treble control of the on board audio processor It runs 0 no effect through 255 This option can be used to generate keyboard driven brightness shifts 28 10 The Auto Trill Menu The Auto Trill is another sweep effect Its output may be assigned to the 4 Voice pitch bend the 4 Voice VCF an arbitrary controller or pitch bend on the MIDI output and or the Tone Volume Balance processor The Auto Trill is triggered by MIDI commands sent to the basic Interface input
64. nges between 0 and 63 If the portamento has been turned OFF under the Portamento mode set above there will be no effect until it is turned ON 6 UNISON This is a remote of the Unison switch on the 4 Voice Keyboard module It can be turned ON or OFF 15 7 SPLIT M This remotes the Split functions available on the 4 Voice Keyboard module It may be set to OFF 2 2 3 1 1 3 When off no split is active and the keyboard is continuous The other settings correspond to the allocation of voices available per half The Reassign function does not work when the 4 Voice is in a split mode this is the way the 4 Voice always functioned 8 REASSIGN This remotes the Reassign switch on the 4 Voice Keyboard module which determines whether recurrent notes are stolen from previously allocated voices or new voices are sequentially allocated upon the receipt of each new key down It may be set ON or OFF Under split mode its setting is irrelevant since reassign doesn t work with a keyboard split 9 ASSIGN This remotes the Assign switch on the 4 Voice Keyboard module which determines how the voices are allocated It may be set to R C CONT RESET The meaning of these are described in the 4 Voice user s manual CONT selects the cyclic reallocation of notes R C always starts with voice 1 when a the first key is hit then reallocates following notes in a cyclic fashion as long as the first key is still held down and RESET will alloc
65. nk Current Patch doesn t touch the patch memory however thus doesn t care about the write protect This option will load the currently edited patch on the Macintosh into the currently active patch in the Interface This is the easiest way to try a patch out merely hit the keyboard shortcut combination answer the keyboard prompt and the patch is active in the Interface The Patch menu provides a means of displaying and editing patch data The Show Title option will bring up the window that shows the resident patch numbers and titles as discussed above The next three items allow one to change the designation of currently edited patch If Load Patch is picked the user is prompted to type in the number of the patch to be considered currently edited its title will be made bold if the Titles display is selected The Next Patch and Previous Patch items will scroll forward by one patch or backward by one patch the keyboard shortcuts for these options provide a quick means of perusing sequential patch data The following 8 items will cause data from the currently edited patch to be displayed This data can be edited and changed by selecting the Edit Item option at the bottom of the menu or by typing E The Title Patch option is the simplest this displays the patch title and allows it to be changed through the Edit Item option The other 7 items are all menus from the Interface If one of these is selected the data f
66. nter will accept the value and cancel will abort the operation If Enter was depressed the display will alternate the message LOAD with the referenced patch number and title If one indeed wants to load this patch hit Enter again Cancel will abort the operation and leave the resident patch intact Another option exists at this point however which allows one to quickly peruse all 99 patch numbers and titles stored in memory If one hits either or the display will change The patch number plus 1 or minus 1 if was hit is displayed with its stored title The colon separating patch number from patch title flashes under this option The displayed patch is not actually loaded only its number and title are shown One may repeatedly hit or to scroll through all patches the gap between 1 and 99 is automatically bridged whenever surpassed in either direction If one doesn t want any of these patches Cancel will abort the operation If however one hits Enter the sequence flashing LOAD will return but the patch number displayed will be the last patch inspected One can again hit Enter Cancel or as discussed above If Enter is chosen the patch is loaded and a confirmation message is displayed Hitting any key will clear this message and return to normal operation exactly where one left off before oon pushing Plus Key When editing a numeric value pressing this key will increment the value
67. ocessor It runs 0 no effect through 255 This option can be used to generate keyboard driven dynamic panning effects 18 BAS FEED This item specifies the amount of Auto Trill feed into the bass control of the on board audio processor It runs 0 no effect through 255 This option can be used to generate keyboard driven bass pulsing effects 19 TRB FEED This item specifies the amount of Auto Trill feed into the treble control of the on board audio processor It runs 0 no effect through 255 This option can be used to generate keyboard driven brightness modulation 20 TRL WDTH This item specifies the duty factor i e pulse width of the Auto Trill pulse or asymmetry of the triangle waveform It ranges from 0 perfectly symmetrical through 255 The setting of this item will also affect the trill frequency adjust items 6 and 7 to compensate if needed The trill width can also be set dynamically via MIDI controller 21 21 WV SEL This item allows one to specify the trill waveform The possibilities are PULSE TNGLE SWEEP The meanings are obvious a pulse wave for the standard trill effect a triangle wave for a smoother change the limited resolution can make this a bit rough and staircase like if it is swept over a wide range or a single sweep as in the Auto Bend The trill frequency may change when the waveform is switched between triangle and pulse it can be compensated by items 6 and 7 if needed The trill waveform can be
68. oes not use the 4 Voice but only employs the MIDI effects and utilities on the Interface s MIDI output A switch has also been added to the 4 Voice that has the same effect as Play Notes if either the switch or this item is set off the MIDI notes are not played 2 PRGM This specifies the program number active on the 4 Voice programmer It runs 1 16 Programs 1 8 reside in the lower 4 Voice memory bank without the red LED illuminated on the programmer while programs 9 16 reside in the upper bank with the red LED shining 3 PBND RNG This specifies the range of the 4 Voice response to MIDI pitch bend commands and Auto Bend Trill effects routed to the 4 Voice pitch bend It runs between 0 and 255 and is essentially uncalibrated maximum bend range is on the order of roughly 1 5 octaves The Interface always uses a full 12 bits of pitch bend thus can achieve a very smooth response with MIDI controllers that send 2 bytes of pitch bend data 4 PMNTO M This is a remote of the Portamento Mode switch on the 4 Voice Keyboard module It may be set to OFF BTH UPR LWR in correspondence with the settings on the actual switch the OFF setting turns the portamento off regardless of the portamento time set under Item 5 below The other values define which half of the keyboard will possess portamento under Split mode 5 PMNTO T This is a remote of the Portamento Time control on the 4 Voice Keyboard module It ra
69. oice ever malfunctions ie notes will be stuck on the program will be unable to be changed or the above switch settings will seem unchangeable it may be readily disconnected from the 4 Voice electronics Remove the Programmer and Keyboard modules Be very careful since cables have been added to these units Remove the Programmer gingerly first the Keyboard module will no longer come out easily if it s attempted to be removed beforehand The cables added to these units terminate in Molex connectors Unplug these connections and insert the dummy plugs provided with this unit in their place Since these three molex connectors are entirely different there is no possibility to cross connect cables or dummy plugs If the supervisory logic seems to be loading down the power supply this isn t normally possible since it s been designed to require under 100 mA or so it may be disconnected from the master Oberheim power supply in the standard fashion 2 Interface Operation and Key Button Functions Display d 16 15 souno Reset Silence Interface Front Panel Upon power up the Interface loads in the last patch that was loaded or saved it also programs the 4 Voice The 12 Character display will show the patch number and title ie 1 amp BIG SOUND The number at left is the patch number running 1 99 and there are 9 characters at right for a user programmable patch title The 10 bar LED array to the right of the alpha n
70. oice synthesizer amp a simple audio processor and optionally drives a slave synthesizer through its MIDI output A highly simplified block diagram of the Interface logic is given in the figure below in this document the rack mount unit is termed the Interface and the circuitry built into the 4 Voice is called the Supervisory Logic Audio In L R MIDI IN MIDI THRU oF Tone Volume Balance Processor Sweep trill amp portamento effects Logic E 4 Voice Control ipe Logic MIDI SEND Logic MM Z 5 XMIT ogic Audio Out L R To 4 Voice MIDI Merge Z Logic d MIDI OUT One sees that this device accomplishes three purposes it controls the Oberheim 4 Voice synthesizer through the 4 Voice Control Logic acts as a powerful MIDI effects generator amp interpreter by merging its own commands generated via the MIDI SEND Logic and Sweep Effects Logic with the incoming MIDI stream through the MIDI XMIT Logic and enables MIDI control over a stereo audio signal Tone Volume Balance Processor The 4 Voice Control logic is configured in the MIDI MODE 4 VOICE SET UP and AUTO PORTAMENTO menus The Send and Xmit logic are configured in the SET MIDI OUT menu The Sweep Effects are configured in the AUTO BEND and AUTO TRILL menus The audio proces
71. otes have been held down for the minimum hold interval the timer will reset with each new note hit notes have to be held down for at least the full timer interval for Auto Trill to trigger If no notes were held long enough the Auto Trill will not be triggered The Auto Trill will always trigger under NRM mode immediately upon receipt of a non zero value for MIDI Controller 83 ie General Purpose Controller 8 or key trigger note on QUE This is the Queue mode If the Minimum Hold Item 9 is set to zero the Auto Trill will not be triggered with any note on or note off activity If however the Minimum Hold is non zero the Auto Trill will be triggered promptly after all notes have been released only if the set of notes were held down for at least the Minimum Hold interval This enables a selective activation of the Auto Trill effect notes have to be held down sufficiently long for the Trill to be activated at the final note release The Auto Trill will always trigger under QUE mode immediately upon receipt of a non zero value for MIDI Controller 83 or key trigger note on CTLR This is the Controller mode It enables the Auto Trill effect to be selectively triggered by the MIDI Controller Auto Trill will not be triggered directly via any MIDI note activity regardless of the Minimum Hold setting MIDI Controller 83 and key trigger note on still has effect however If the Minimum Hold is set to zero the Auto Trill will trigger promp
72. otherwise terrible MIDI feedback can occur locking everything up When the Librarian is launched it prints a few things out then after a second or two builds its menu bar I ll blaze quickly through the menu options below Upon launching the Librarian program the Macintosh assumes 99 vanilla patches exist all labeled lt lt BLANK gt gt Real patches can be brought in by loading them from a file uplinking them from the Interface and or editing the patch variables The File menu enables one to access and write data files that contain Interface patches The Open Load All patch item brings up a file dialog box requesting an input file specification When a file containing patches is opened a running dialog is provided as they are brought in from disk then the Titles display is shown i e all 99 patch names are printed in a window with the patch considered to be the currently edited highlighted in bold The patch data from the file is now in Macintosh memory and can be edited and or installed into the Interface If one selects Open Load Patch a similar scenario ensues one selects an input file to open then after a several second delay all patches are also displayed Here however the user is prompted to enter the patch number to be loaded at the bottom of the window patch numbers are printed to the left of patch titles After entering a number and hitting return the user is prompted to specify the patch number that it w
73. ove under Item 3 and will assume only one voice available across the entire keyboard if MONO is active Overflow notes may be sent to the MIDI output via the Send Overflow option in the SET MIDI OUT menu or any synthesizer attached to the MIDI output can be forced into the assigned key priority through the Echo 4 Voice option in the SET MIDI OUT menu Each of the values for the Key Priority are discussed briefly below OFF key priority is applied The notes are sent to the 4 Voice exactly as they are received This is the fastest option Any delay encountered in the prioritizing software which should be fairly minimal will be eliminated here since all the prioritizing software will be bypassed HI Priority is given to the highest notes LOW Priority is given to the lowest notes FST Priority is given to the first notes that have arrived LST Priority is given to the most recent notes 12 5 REALLOC This item allows the 4 Voice note reallocation routines to be turned ON or OFF If ON and assuming that all available voices are taken new 4 Voice notes are automatically activated whenever an appropriate MIDI note has been turned off and a voice has been freed This option is only relevant if a key priority has been imposed via the previous item 4 otherwise it has no effect and the 4 Voice acts as it normally would If on and if subject to a full multi voice polyphonic MIDI input stream all 4 Voices or less if Split Uni
74. patch dump from the Interface the following dialog is used Computer requesting Dump F0 10 77 00 yy pp F7 The hex 10 specifies an Oberheim product the hex 77 specifies the Joe Paradiso Interface hopefully this code isn t used by Oberheim I picked it for good luck and the 00 specifies that I m requesting a patch dump The yy can be anything Oberheim had this as a channel number but I ignore it The pp specifies the patch number 0 through 49 here unless the patch 100 dump all option is used If it likes your message the Interface will respond Interface giving Dump FO 10 77 01 yy pp Patch Data 210 bytes per patch 20580 bytes for all F7 The Interface s return message has a nearly analogous header As a bit of additional information however the yy parameter is now the value currently assigned to the Interface s basic MIDI input channel under the resident patch The pp is the patch number that is being dumped hopefully it agrees with the number actually requested The patch data follows 4 bits at a time The message finishes with an End of Sys Ex command ie the F7 If the Interface didn t like the original dump request message it will ignore it and not respond The messages more or less reverse if a patch load command is sent to the Interface The protocol is listed below 42 Computer Commanding Memory Load FO 10 77 01 yy pp Patch Data 210 bytes per patch 20580 bytes for all F7 All items are as
75. per two items 5 Fill delay and 6 Fill note have been included to allow custom tailoring of this option to the perks of various synths This option can introduce potential delay into the MIDI output and might insist on creating pop sounds or glitches with some synths The output Fill can be used with any of the MIDI output options in this menu 19 8 DLY TRG This item the Delay Trigger allows one to delay the sending of note on s to the MIDI output or impose a minimum key down constraint on notes played upon release Its operation depends on the setting of Item 9 the Note Trigger as described below If notes are to be triggered on attack a non zero Delay Trigger will introduce a delay between the receipt of notes and their being sent to the MIDI output If any notes are turned off before this delay has expired they will not be included in the notes sent only notes currently held down are sent to the MIDI output after the delay has expired The delay is reset whenever new notes are hit notes must be held down for the full delay interval for any MIDI output activity to occur Note Off s are however sent promptly with no delay If notes are selected to trigger on key release via Item 9 below the action is somewhat different A non zero delay trigger will now mean that notes must be held down for at least the delay interval in order to be queued for playing upon key up Any notes held down for a shorter interval will not be sen
76. ponds with the split point set in the 4 Voice hardware thus each keyboard half ie each set of voices under this option can be made to sound entirely differently through the 4 Voice Split Mode 11 and will reside on separate MIDI channels This option may be useful in MIDI sequencing applications A few drawbacks do exist however the pitch bend commands accepted only on the base channel will affect both sets of voices The range of each voice is also somewhat limited The lower voice has 24 notes available while the upper voice has 40 notes the 4 Voice keyboard range is extended somewhat under MIDI The offset is automatically added into the upper keyboard notes the commanded note numbers for both keyboard halves will both start at the same value as set through the transpose item 6 discussed below Notes sent above or below their limits are not sounded but can be routed to the MIDI output through the Send Overflow option as will be discussed with the SET MIDI OUT menu 3 MONO This item allows a software driven mono mode to be set on and off When off the 4 Voice will operate in a polyphonic mode depending as usual on the settings of Split Mode and Unison When on however the Mono option will only allow one key to be down at a time Any previous note is turned off when a new note arrives If several notes are held down in the MIDI input stream the key priority can be set with Item 4 discussed below This option may be us
77. put These are notes lying outside of the 4 Voice keyboard range and or notes in excess of the available 4 Voice voices provided that a Key Priority or Mono Mode has been imposed via the MIDI Mode Menu 4 XMIT PB This item specifies whether MIDI pitch bend data received at the MIDI input will be relayed to the MIDI output If set ON pitch bend data is relayed subject naturally to the general restrictions on MIDI transfer imposed by the XMIT Mode of Item 2 above If set OFF all incoming pitch bend data is filtered out and not transmitted Pitch bend data generated by the Interface ie in Auto Bend or Auto Trill is not affected This item was included in order to reduce the potential overload or confusion that could be caused by transmitting pitch bend data to a slave synth that is also bending under Auto Bend or Auto Trill 18 5 FILL DLY This item may be set OFF or ON It refers to the output voice filling option which is described in detail under Item 7 below When ON the Fill Delay will insert a small delay in between the Note on s and Note off s that are sent to allocate all of the output voices This delay may be necessary for some keyboards like my Mirage that can be confused by an extremely rapid stream of Note on s followed immediately by a rapid stream of corresponding Note off s Of course some keyboards may be unaffected thus no delay is inserted when this item is turned OFF operation of the MIDI output may be
78. r is recorded while the Sostenuto pedal is held down If this parameter ranges between 1 and 128 a MIDI note is selected to provide the record trigger The chosen note is this parameter minus 1 since the MIDI note range is through 127 If this note is hit once the record option is activated Notes are entered into the buffer as they are played the buffer can store up to 251 notes Recording stops when this key is hit again although no more than 251 notes will be stored One normally will set this key to be outside the range that sounds on the keyboard in order to prevent accidental record toggling during a performance The Key Safe item under the MIDI MODE menu allows one to specify a safety feature where the Soft Pedal must be down while record mode is selected or deselected Occasionally one may become confused as to whether the note buffer is recording or not in these cases hit the Silence button on the Interface panel this always turns the note record off If this item is set to its maximum 129 the record mode will never be activated 13 OUT PLAY This parameter specifies the notes that are sent to the MIDI output It may be set to NTE BUF The NTE setting is the standard option it merely sends the notes that are being played to the MIDI output The BUF setting sends notes from the note buffer to the MIDI output This item may also be set through MIDI controller 28 The selection of buffer notes is specified in item
79. rom the corresponding menu page for the currently edited patch is displayed This display format gives the item name followed by its numeric value in the patch followed by the alphanumeric option name provided that the menu item is one that takes options rather than a number These quantities can be changed through Edit Item a prompt will appear below the data list asking for the item number to edit Merely enter this index then hit return For numeric arguments a dialog box is produced that shows the lower and upper limits For character arguments a list of all possible values is presented In both of these cases merely type in the desired value then hit OK or carriage return The new value will be shown in the updated menu item list The Print menu allows the user to print data from a patch or group of patches If Titles is selected the Title page is printed showing the names of all resident patches If Page is selected the currently edited menu page is printed If Patch is selected all pages of the currently edited patch are printed If All Patches is selected the user is prompted for a start and end patch number all patches within this range are printed The FF after Pages option when checked will force a form feed to occur after each menu page is printed resulting in one menu page per physical page The MIDI menu allows one to set communication defaults The middle 3 options set the Macintosh MIDI interface data
80. rwise the same voice would sound and the others would remain intact Instead keys shifted up and down by octave intervals relative to the new note are hit on the 4 Voice giving a thick sound If an octave can not be used because the latest note is too close to the edge of the available keyboard or notes already held down are at octave intervals the Autocrd algorithm will look for fifths giving an even thicker sound The delay needed for the Reassign ON case is not used here all notes will sound almost instantaneously Autocrd is disabled if Unison is set on It knows about the Split status and will allocate however many voices are available per keyboard half although only the Reassign Off option is intrinsically available under Split If the Delay option is 13 active under the Auto Portamento menu Autocrd may assume an extra voice to be available thus it might sound slightly different The same or octave fifth notes are played under Autocrd if the INTERVAL setting is set to OCT If it is set differently the intervals programmed by the user as discussed below are used to determine the notes actually played If the interval won t fit because the edge of the keyboard is too close the chord is appropriately inverted The Reassign On mode of this effect will still insert a small delay between each note thus the chord is slightly flammed while the notes will play simultaneously under Reassign Off For the full Autocrd
81. s what actually might happen allowing more than 99 patches 99 is quite a few for just controlling the 4 Voice but this box is capable of doing many other things and eventually building a Macintosh based patch editor librarian which would be easier to deal with than the keypad based software resident in the Interface The Sys Ex protocol was designed to resemble the usual Oberheim standard to some extent thus some of the more powerful commercial patch librarians might be coaxed into backing this device up amp re loading it when necessary The patch data is dumped amp loaded at 4 bits per MIDI byte The 4 low bits are sent first followed by the 4 high bits all patch items are assumed to be 8 bits long The patch data begins with a byte bearing the patch number followed by a 9 byte ASCII patch title The contents of the 6 menus follow sequentially after this as laid out in the text above remember that each menu item occupies one byte A total of 105 bytes are thus sent with each patch expanding into 210 bytes over MIDI not counting Sys Ex headers and trailers If all 99 patches are dumped simultaneously by addressing patch 100 10 395 bytes will be sent resulting in a transfer of 20 790 MIDI bytes The MIDI stream sent to the Interface must agree exactly with the protocol specified below otherwise the command will be ignored All numeric quantities referenced in the discussion below are in hexadecimal In order to request a
82. sic input channel The value associated with this controller command is ignored 125 Set OMNI to X CTLRS The OMNI parameter Item 2 of the MIDI Mode Menu is set to X CTLRS subsequent MIDI note commands amp MIDI sustain will be accepted regardless of their transmitted channel number All other subsequent MIDI data however must be issued over the assigned basic input channel for Interface recognition The value associated with this controller command is ignored 126 Set MONO Mode and Unison to ON The 4 Voice is put into MONO ON mode see Item 3 of the MIDI Mode Menu and the 4 Voice Unison is activated This is a quick amp dirty way of dynamically putting the 4 Voice into a mono mode with key priority imposed using all available voices The value associated with this controller command is ignored 40 127 Set MONO Mode and Unison to OFF The 4 Voice is put into MONO OFF mode see Item 3 of the MIDI Mode Menu and the 4 Voice Unison is deactivated This is a quick amp dirty way of reversing the above command and restoring the 4 Voice polyphony The value associated with this controller command is ignored 41 13 System Exclusive Commands A System Exclusive protocol was designed into the Interface to enable patches to be dumped amp loaded via MIDI This is useful for several potential reasons ie backing up the 99 resident patches the on board Lithium battery is supposed to last over 20 years but who know
83. son or Mono are selected will be continually active automatically reassigning whenever a voice frees up This can sometimes sound fairly frenetic If the 4 Voice is following a multi voice polyphonic passage it may sound better if this option is turned OFF This will prevent voices from jumping around when several keys are held down ie the Interface will not instantly reallocate any voice that has been freed up If Reallocation is active the voices are reallocated according to the note priority in the HI and LOW case ie the voice is reallocated to the next highest or lowest unsounded note as set in Key Priority The closest unsounding note is used if the Key Priority is set to FST or LST The MIDI output will track what happens here in the Send Overflow or Echo 4 Voice modes The Reallocation knows about the keyboard split if Split Mode is active and will select notes appropriate to each keyboard half It also is aware of the Unison and Mono settings 6 TRNSPSE This item allows one to specify a transpose value in note s 1e semitones that will be subtracted from the input MIDI note on amp note off commands This value ranges 0 127 and represents the base note corresponding to the lowest key on the 4 Voice or 4 Voice half if the Multi timbral option is selected under Item 42 Any notes that are below this value or above this value plus the appropriate keyboard range will not be sent to the 4 Voice but may be directed to t
84. sor is adjusted in the TONE VOL BAL menu The detailed function of these various menus and the means by which they are edited are explained in the succeeding chapters of this manual Rear panel Interface jacks include standard MIDI in out thru 14 inch Bend out phone jack a 44 inch VCF Ctl phone jack two inch Audio in amp two 4 inch Audio out jacks and a 25 pin mini DIN connector used typically in RS 232 devices This DIN connector links the unit with the 4 Voice It is not a typical RS 232 standard however so standard RS 232 cables may not work since they do not connect to all of the pins in the connector A cable must be used that connects all 25 pins and is preferably shielded This cable can probably be made as long as needed since all signals are differentially driven cable length should not be too critical The pitch bend and filter control analog voltages are also routed through a balanced pair in the DIN connector In case this causes problems ie injection of digital noise into the 4 Voice oscillators and or filters the bend voltage and or filter voltage can be run through a standard guitar cord cable merely plug into the corresponding 5 jack on the rear of the Interface unit and run this into the appropriately labeled jack added to the rear of the 4 Voice Inserting a 14 jack into the 4 Voice in this fashion automatically cuts off the pitch bend feed or filter feed included with the DIN cable
85. t to the MIDI out Again the delay will reset with each new key hit as above The delay setting is allowed to range from 0 255 The delay scaling is on the order of 1 20 th of a second per Delay Trigger count unless 255 is selected which will will cause a huge delay on the order of minutes This large delay might be handy if a MIDI controller is used to terminate the delay and send the notes to the MIDI output This is accomplished by the HOLD 2 MIDI controller controller number 69 If this controller is sent with an ON value during a Trigger Delay the delay will terminate and the notes will be sent to the MIDI output or queued for playing upon note release depending on the setting of Item 9 the Note Trigger This can enable applications such as footswitch control over notes applied to the MIDI output One final hint should be made here the timer LED on the Interface front panel rightmost in the row of diagnostic lights next to the display labeled T will be illuminated while the Delay Trigger is active this might be useful visual feedback for setting an appropriate delay One must be careful however in that the delays used by the Auto Bend and Auto Trill will also illuminate this LED thus this hint might not be accurate if these other options are simultaneously enabled amp put under a delayed trigger 9 NOTE ON This item allows the Note Trigger to be set It dictates how notes will be sent to the MIDI output and takes three
86. taken under this setting is heavily dependent upon the setting of the Trigger Source Item 10 below Details are given with the Trigger Source description The zero value of Minimum Hold is replaced with the characters RLS since a zero Hold value will cause the Auto Trill to trigger on last note release if the Trigger Mode is set to NRM Note that the T LED to the right of the display will be illuminated while the minimum hold delay is active this might be useful in setting up patches but beware since delays in Auto Bend and the MIDI output along with the Trilling operation itself can illuminate this LED as well 10 TRIGGER This allows one to select a Triggering protocol for the Auto Trill effect It can take three values ie NRM QUE CTLR The action taken under each value is dependant upon the setting of the Minimum Hold Item 9 listed above Each possibility is discussed below Note that the MIDI controller that triggers the Auto Trill effect is 83 ie General Purpose Controller 48 A trigger source can also be derived from a specified key on the input MIDI controller see item 14 below The operation of this logic is entirely analogous to the triggering of the Auto Bend described with the previous menu 30 NRM This is the Normal mode If the Minimum Hold Item 9 is zero the Auto Trill will be triggered after the last note held down is released If the Minimum Hold is non zero the Auto Trill will be triggered after the n
87. th the switches on these 4 Voice modules the supervisory logic should be reset first as detailed above In addition a MIDI Control toggle switch has been added to the 4 Voice panel to the right of the above mentioned LED If this switch is up the green LED nearby is illuminated and the 4 Voice will not respond to incoming MIDI note commands it will however still be programmed and configured under MIDI Interface control only note on off s are inhibited In order to run the 4 Voice under external Interface control a subset of switches on the Keyboard module should be set to the positions listed below Switch Position for MIDI Control Split OFF Split Mode 2 2 Center Portamento Mode Both Center Unison OFF Portamento OFF Reassign ON Assign R C Center The Interface unit remotes the functions of these switches as well as the Program selection and Program bank switches Their settings can now be dynamically controlled through MIDI commands In addition the portamento time potentiometer should be fully counterclockwise off and the VCF control should be around center in order to allow their reproducible adjustment through the Interface Note commands sent through MIDI will have access to a wider range than normally exists on the 4 Voice keyboard 64 notes are available through MIDI which gives roughly an extra octave and a third A quick note on contingencies is in order if the supervisory logic resident in the 4 V
88. therwise retained although Item 2 of the 4 Voice Setup Menu is altered to agree with the new 4 Voice program Any MIDI program change commands specifying programs exceeding 115 are ignored a program change of 99 is also ignored MIDI Controllers A host of MIDI controllers are available to augment Interface operation Although many details were presented earlier in the discussion of the corresponding Menu items everything dealing with MIDI controller response is summarized below 64 Sustain Pedal This functions as usual any notes currently down continue to sound along with any new notes until the sustain off command is issued This is the only MIDI controller that is not restricted to be commanded over the basic input channel when the OMNI item 2 in the MIDI Mode list is set to X CTLRS or MULTI this is done because the sustain operation is correlated with note commands which are accepted over several MIDI channels in these modes 123 All Notes Off If the sustain pedal is not down all notes on the 4 Voice and MIDI output if selected will be turned off If the sustain pedal is down the All Notes Off is queued for execution immediately upon release of the sustain The MIDI channel transmitted with this command must always agree with the basic input channel set in the MIDI Mode menu regardless of the OMNI setting The All Notes Off is ignored if a different channel is used All of the controllers listed below change ite
89. this volume setting 2 VOL VSCL This parameter specifies the velocity sensitivity i e last attack velocity from the input MIDI controller on the volume Hitting a key harder will cause a louder signal This item runs from 0 no effect through 127 3 BALANCE This item specifies the right left channel balance It runs 0 through 255 A value of 128 is center 0 is hard left and 255 is hard right 4 BAL VSCL This parameter specifies the velocity sensitivity i e last attack velocity from the input MIDI controller on the balance Hitting a key harder will move the audio balance further right This item runs from 0 no effect through 127 5 BASS This parameter specifies the bass response It runs 0 through 255 A value of 130 will specify flat bass response 6 BASS VSCL This parameter specifies the velocity sensitivity i e last attack velocity from the input MIDI controller on the bass Hitting a key harder will produce a bassier sound This item runs from 0 no effect through 127 7 TREBLE This parameter specifies the treble response It runs 0 through 255 A value of 125 will specify flat treble response 8 TRB VSCL This parameter specifies the velocity sensitivity i e last attack velocity from the input MIDI controller on the treble Hitting a key harder will produce a brassier sound This item runs from 0 no effect through 127 9 INPUT This parameter specifies whether the input signals are in stereo or bridged to mono
90. tly upon receipt of a non zero Controller 83 value and key trigger note on If the Minimum Hold is non zero Auto Trill will not trigger immediately after receipt of Controller 83 and key trigger note on but will queue its activity causing the Auto Trill to trigger after all notes have been released 11 OUT CTL This specifies the destination of the Auto Trill effect for the MIDI output If it is zero causing the display to show PB rather that zero the Auto Trill will command the pitch bend over the assigned MIDI output channel If it is non zero it ranges up to 121 the assigned value denotes the commanded MIDI controller number addressed by the Auto Trill If the MIDI output is deactivated through Item 12 below this setting will have no effect 12 CONTROL This item determines devices that are commanded with the Auto Trill effect It can take three values 4VCE OUT BOTH Each are described below 4VCE The Auto Trill will control only the 4 Voice pitch OUT The Auto Trill will control only the MIDI output as set through Item 11 above BOTH The Auto Trill will control both the 4 Voice and the MIDI output 13 INIT VAL This item runs from 0 through 127 and sets the baseline value of the MIDI controller selected through item 11 above if no MIDI controller has been selected this item has no effect The controller is set to this value when a key is hit the Interface is reset through front panel switches or MIDI comm
91. to quickly peruse all 99 patch numbers and titles stored in memory and pick the appropriate candidate to overwrite If one hits either or the display will change The patch number plus 1 or minus 1 if was hit is displayed with its stored title The colon separating patch number from patch title flashes under this option The displayed patch is not actually overwritten at this point only its number and title are shown One may repeatedly hit or to scroll through all patches the gap between 1 and 99 is automatically bridged whenever surpassed in either direction If one doesn t want any of these patches Cancel will abort the operation If however one hits Enter the sequence flashing OVRWRITE will return but the patch number displayed will be the last patch inspected After a successful save a confirmation message is displayed on the screen Depressing any key will clear this message and continue operations exactly where you left off before pushing If the write protect flag was set see description under below the display will complain accordingly and the save operation is intrinsically aborted Equals key 2 This key always means Load Patch Whenever it is depressed the display will show LOAD PGM and the cursor will flash at right as it waits for an entry The default is the current patch number as listed Numeric data may be entered by keying in a number or hitting or C as described above E
92. umeric display is for diagnostic purposes the leftmost 8 LEDs represent the 8 bit command sent to the 4 Voice the 9 th LED is the strobe sent to the 4 Voice and the rightmost LED is the timer flag this is perhaps the only one that is useful to an operator ie it is illuminated when the Interface is performing a timed wait The twin rows of LEDs to the right of the display show the input levels for the external audio signal The audio level is adjusted to avoid frequent firing of the topmost red LEDs and possible distortion clipping As there is no level control for these inputs on the Interface unit they must be adjusted at the source The display can show two diagnostic messages if a hardware or software failure ever occurs One is the message ACIA ERROR which indicates a major problem with the incoming MIDI stream If this shows up one should re boot check connected MIDI devices cabling etc before trying again The other message is MIDI OVFLOW which indicates that the MIDI input stream was deluged by an incessant flood of rapid fire MIDI data This should never happen however the available buffer for MIDI input data is relatively massive and the processor is fast enough to avoid accumulating significant backlog Below the display are two buttons One is labeled RESET this basically re boots the Interface just as the initial power on does and should be used in extreme panic situations ie if the Interface locks up due to a
93. under Item 1 ON Omni mode is turned on The Interface will respond to all incoming MIDI commands regardless of their channel number The only exception to this however are the channel mode commands ie MIDI controllers with index greater than or equal to 123 including the All Notes Off command In these cases the channel number associated with the MIDI command must agree with the channel set above in Item 1 X CTLRS This is a more restrictive OMNI mode The Interface will respond to note on amp note off data arriving on any channel as with OMNI ON but will only accept controller data except for sustain pitch bend data and program change data arriving on the basic channel specified in Item 1 MULTI This is a quick and dirty hack at running the 4 Voice in a multi timbral mode As with the X CTLRS mode specified above all controller except sustain pitch bend and program change commands must be sent over the basic channel specified in Item 1 in order to be accepted Note on amp Note off commands however are processed differently Note commands sent on the basic channel will turn notes on and off only in the lower half of the 4 Voice keyboard ie the lower 24 4 Voice keys Note commands sent on the basic channel plus one will turn notes on and off in the upper half of the 4 Voice keyboard ie 4 Voice keys 25 through 64 Commands sent on other MIDI channels will be ignored The key boundary specified here corres
94. values ie NRM QUE CTLR The action taken under each value is dependant upon the setting of the Minimum Hold Item 9 listed above Each possibility is discussed below Note that the MIDI controller that triggers the Auto Bend effect is 82 ie General Purpose Controller 7 A trigger source can also be derived from a specified key on the input MIDI controller see item 14 below 26 NRM This is the Normal mode If the Minimum Hold Item 9 is zero the Auto Bend will be triggered after the last note held down is released If the Minimum Hold is non zero the Auto Bend will be triggered after the notes have been held down for the minimum hold interval the timer will reset with each new note hit notes have to be held down for at least the full timer interval for Auto Bend to trigger If no notes were held long enough the Auto Bend will not be triggered The Auto Bend will always trigger under NRM mode immediately upon receipt of a non zero value for MIDI Controller 82 ie General Purpose Controller 7 or key trigger note on QUE This is the Queue mode If the Minimum Hold Item 9 is set to zero the Auto Bend will not be triggered with any note on or note off activity If however the Minimum Hold is non zero the Auto Bend will be triggered promptly after all notes have been released only if the set of notes were held down for at least the Minimum Hold interval This enables a selective activation of the Auto Bend effect notes

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