user manual - MIDI hardware
Contents
1. 5 4 V oct fine tune After you ve selected the scale as described before you may want to fine adjust it to match your expectations within single mV per octave Fine tuning is only available for V oct scales Hz V scales are factory calibrated to maximum 1 cent of tuning error over entire keyboard range and cannot be adjusted by the user To enter fine tuning mode do the following 1 press the Learn button four times 2 select fine adjustments with MIDI keyboard Lowest note means no adjustment the scale remains as set in V oct scale select procedure 61th key means increasing the scale of about 2 semitones per whole 5 octaves assuming you re working on 1V oct scale Every key in between sets the fine adjustment proportional to played key position 3 at this time CV will output new scale value to be measured with voltmeter This is the value for only 1 octave and to achieve full accuracy you may then want to measure the voltage after playing a key that is 3 or 4 octaves higher than the lowest one More precise tuning is possible via Sys Ex 6 User settings via System Exclusive All settings described in chapter 5 are also accessible via MIDI System Exclusive messages But Sys Ex is the only way to set them separately for each CV output The command s structure is as follows FO Sys Ex header 00 20 7A manufacturer ID for MIDI hardware 01 device ID for MIDImplant 01 02 CV output ID 01 08 command associated p2. so lowest note gives 5V output and top note gives OV This may be helpful in synth circuits where reversed response control input can be added easier than the straight one When configured in Hz V scale the voltage always reaches 4V at the top note which is often treated by Hz V synths as standard voltage required to reach top C note on the keyboard The lowest note may start at 5 different levels from 0 125 to 2V depending on number of octaves chosen This is described in chapter about tuning 5 3 5 4 4 2 Gate outputs Each Gate output associated with CV output generates voltage indicating the duration of MIDI note When MIDImplant is configured to respond to MIDI notes gate output remains at OV when no notes are playing It then goes up to the supply voltage level and stays there until all notes are released as in typical V trigger mode It is possible to reverse the Gate signal individually for each output so note on is then at OV and note off is at power supply level By default Gate output re triggers on next note if previous one is still on i e when playing legato Gate is turned off for very short time 0 5ms which is usually enough to re trigger envelopes etc It s also possible to re trigger on note off so when you release any key gate will re trigger if there was any held note still Re trigger can be turned off completely if you want to have flat gate signal as long as any note is playing All those settings are
3. with the wheel Same applies to all other controls except notes If it s going to be note on off you must play the lowest note of your keyboard to be associated with CV2 With next note played CV2 will output voltage according to MIDI note and Gate2 will go high whenever there s any note pressed You should never assign the same keyboard to both CVs Only CV1 will work then You can have two independent note CV outputs only if each of them is played in different MIDI channel The only way to have 2 note CV outputs is to setup CV1 first and then CV2 Setting CV1 as note on off will always change CV2 to velocity output regardless of how it was programmed before 5 3 Keyboard scale select MIDImplant comes factory calibrated to 1V oct scale but you can change it anytime to another V oct ratio or Hz Volt response If selected by Learn button the scale is the same for botch channels CV1 and CV2 so if you change it for the keyboard associated with CV1 remember that CV2 will also work in altered scale To have V oct in one CV and Hz V in the other one or different V oct rations in 2 channels the only way to do it is via Sys Ex configuration see chapter 6 The scale setup applies only to MIDI note on off events All other controls always use full 0 5V range for MIDI parameter value No scaling is available for those To change the scale of your note CV you must have the keyboard already associated to CV1 If it s already done do the fol
4. FO 00 20 7A 01 01 03 06 F7 1V oct calibrated scale for CV1 FO 00 20 7A 01 02 03 06 F7 1V oct calibrated scale for CV2 FO 00 20 7A 01 01 04 00 F7 normal Gate1 polarity FO 00 20 7A 01 02 04 00 F7 normal Gate2 polarity FO 00 20 7A 01 02 05 00 F7 velocity CV changes at note on and off FO 00 20 7A 01 01 06 00 F7 Pitch Bender affects notes at CV1 FO 00 20 7A 01 02 06 00 F7 Pitch Bender affects notes at CV2 FO 00 20 7A 01 01 07 00 F7 normal dependency of voltage against note at CV1 FO 00 20 7A 01 02 07 00 F7 normal dependency of voltage against note at CV2 FO 00 20 7A 01 01 08 02 F7 Gatel re triggers in legato FO 00 20 7A 01 02 08 02 F7 Gate2 re triggers in legato FO 00 20 7A 01 01 09 40 F7 CV1 offset OmV FO 00 20 7A 01 02 09 40 F7 CV2 offset OmV You should never in any case send all Sys Ex sequences immediately in one go It needs at least 10ms delay between the commands so if your Sys Ex editor does not allow for introduction of short delays send each of the sequences separately The best way to do it is via on line configurator at www midimplant com config3 html When you go to that page select needed parameters from drop down lists and click create MIDI file Then play that file to MIDImplant and all the configuration is done and saved Default selection of parameters in that page will turn the MIDImplant to its factory settings
5. done by SysEx only If CV is configured to anything else than notes associated Gate stays off at all times 4 3 MIDI repeater output This output can be used to add MIDI THRU to your MIDI2CV device The signal available here is regenerated and MIDImplants can be chained using this option without limits This is not actual MIDI THRU because it introduces slight delay and chaining dozens of MIDImplants may cause noticeable delays To comply with MIDI standard MIDI repeater output must be connected to lead number 5 of THRU DIN socket while contact 4 of the socket must be connected via 220 ohms resistor to 5V source MIDImplant cannot provide 5V for that purpose so the voltage must be taken from elsewhere for example 78L05 regulator supplied from the same power supply as MIDImplant Connector 2 of THRU DIN socket should be connected to ground 5 User settings with Learn button After successful installation you can set up the MIDI events associated with each CV output To do so your synth must be powered on and Learn button connected see the layout There are only 4 parameters to set this way 1 channel and MIDI event for CV1 gate1 2 channel and MIDI event for CV2 gate2 3 Keyboard scale select common for both CVs 4 V oct fine tuning common for both CVs To select which parameter you want to edit press the setup button appropriate number of times Press once for setting CV1 twice for CV2 3 times for scal
6. power supply ground and reference point e TOROS fe for CV outputs 4 NM adeedeoe Lapar A e CV outputs 5 6 nfo os ee oo e MIDI repeater output 7 se TOOL qit e setup Learn button input 8 o aO0 e Gate outputs 9 10 lt S M M The Learn button should be connected between the pad indicated in the picture and ground You don t need it if Sys Ex will be used or if default setting is OK channel 1 starting note C MIDI 36 1V oct velocity on CV2 MIDI IN signal from DIN socket pins 4 and 5 should be connected to pads 1 and 2 of MIDImplant DIN terminal 5 goes to leftmost pad of MIDImplant DIN terminal 4 goes to 2 pad as indicated in the picture above Middle contact of DIN socket number 2 must not be connected anywhere it must be left open to comply with MIDI specification There is LED on board that indicates presence of MIDI signal It blinks whenever MIDI comes IN If MIDI is decoded to be within selected range configured for CV1 or CV2 the blink is stronger 3 Power supply First connect the ground input as shown in layout diagram The ground pad should be connected with reasonably thick wire to the same reference ground that was used to measure all voltages during calibration of your synthesizer The quality of ground connection directly affects the quality of generated Control Voltage It s the reference point of CV outs and if there is any noise or voltage offset at your selected ground source it will b
7. MIDImplant micro MIDI 2 CV device version 3 8 USER MANUAL Roman Sowa 2015 www midimplant com 1 Overview Thank you for choosing MIDImplant as your new MIDI2CV converter This short manual will guide you through installation and available settings The board can be mounted inside any electronic instrument thanks to its small size No mounting holes are provided The strength of connecting wires is enough to secure it in place as it weighs barely 2 grams If flexible wires were used you may add a bit of 2 sided adhesive tape to make sure it does not get loose or stick it on a drop of hot melt glue MIDImplant has 2 groups of analog outputs suitable to control analog synths with V oct or Hz V scaling MIDImplant comes factory set to 1V oct scale CV1 responds to MIDI keyboard on channel 1 and C lowest key CV2 is velocity output Each CV can be reassigned to different type of MIDI event not only keyboard notes this is described in chapter 5 The board requires only single power supply and most important settings are done with use of one SPST button it s not part of the delivery any normally open momentary switch will work More settings are accessible via MIDI System Exclusive commands 2 Layout Picture below shows how to locate the soldering pads in MIDImplant and depicts their role Counting from left to right they are MIDI input 1 2 meja m f Ort z power supply 6 17V 3 2 i pi mil tis et be ae hat ig
8. arameters length varies for different command F7 Sys Ex footer This is described in details here All numbers are represented in hexadecimal format You may use any kind of Sys Ex editor to send those commends to MIDImplant MIDI OX midiox com or SendSX bome com are good examples At www midimplant com config3 html you can find easy to use tool for selecting every parameter of MIDImplant It creates standard MIDI file that can be played towards MIDImplant and set all desired parameters without need for any knowledge of System Exclusive or special editor The file can be transfered to MIDImplant from any sequencer as long as it has Sys Ex transmission enabled 6 1 Channel and event FO 00 20 7A 01 lt CV gt 01 lt channel gt lt event gt lt param gt F7 where lt CV gt is CV output selector 01 or 02 lt channel gt is MIDI channel in range 1 16 01 10 in hex lt event gt with related lt param gt is MIDI event from the list below Only 2 kinds of event require additional parameter notes and Continuous Controller For others this byte may be omitted event MIDI event type meaning of param 01 Note on off starting note 02 Polyphonic Aftertouch 03 Continuous Controller CC number 00 7F 04 Program Change 05 Channel Aftertouch 06 Pitch Bend If CV1 is assigned as note on off CV2 will be automatically set to note velocity To change this follow any procedure for CV2 assignme
9. ations There s also offset trim possible for each CV individually see chapter 6 9 Scale and offset settings work in conjunction the same way as relevant trimmers in any VCO circuit Sometimes the scale is called width while offset can be called tune 6 3 V oct and Hz V scale select FO 00 20 7A 01 lt CV gt 03 lt select gt F7 where lt CV gt is CV output selector 01 or 02 lt select gt takes one of 7 possible values 00 set CV output to variable V oct scale tuned by parameter described in 6 2 01 05 set CV output to Hz V scale and define how many octaves are accessible 06 set CV output to fixed calibrated 1V oct scale In Hz V mode lt se ect gt 01 sets only one octave range and lowest voltage is 2V select 05 means 5 octave range with starting note at 0 125V Although MIDImplant is factory calibrated to match Hz V response within 1 cent over full 5 octave range it may be sometimes desirable to limit the number of octaves and start with higher voltage to achieve best accuracy at lowest notes When select 6 the CV turns to factory calibrated 1V oct scale at 100k load with lowest possible tuning errors Variable V oct scale tuned as described in chapters 5 3 5 4 and 6 3 exhibit slightly bigger errors within 2 cents over 5 octaves span 6 4 Gate polarity FO 00 20 7A 01 lt CV gt 04 lt polarity gt F7 where lt CV gt is CV output selector 01 or 02 lt polarity gt takes one of 2 poss
10. e directly transformed to errors in pitch However you may compensate small DC offsets via SysEx See chapter 6 9 for details MIDImplant is designed to work with typical supply voltages present in any electronic instrument It requires only one positive supply line and voltage range from 6V up to 17V preferably 12V to 15V Current drawn is about 2mA It can be taken from any place inside the synth as long as it does not exceed 17V Power input must be DC Connecting AC power or reversing the power leads will immediately damage the board 4 CV gate outputs MIDImplant has 2 sets of outputs CV outputs have series resistance of 100 ohms and should be connected to resistance of 100k to achieve calibrated precision in 1V oct setting It is possible to use it with other loads but no less than 10k otherwise it may be difficult to reach full range 5V and maintain precision Usually CV inputs have 100k impedance so it s perfectly OK If MIDImplant is destined for a box module with CV jacks you should consider adding voltage buffers Gate outputs use high side transistor with 1k output resistor Gate signal amplitude is equal to the voltage of power supply 6 17V 4 1 CV outputs Each CV output can be configured to respond to one MIDI event Both outputs are independent to some extent The only case when they work in conjunction is CV1 configured as MIDI notes CV2 then becomes Velocity output for the notes played by CV1 It is possible the
11. e select or 4 times to fine tune the scale There s no time limit for pressing the Learn button several times But don t push it too fast because it may be treated as contact bounce and ignored All user settings are memorized in nonvolatile memory taking power off does not reset anything to defaults the settings are kept as they were last entered 5 1 Channel and event of CV1 and Gate1 1 press Learn button once 2 generate MIDI event from your device connected to MIDImplant If it s going to be Pitch Bend CV1 will be set as such with first movement of your Pitch Bend wheel It will then follow your Pitch Bend movement by outputting voltage proportional to what is happening with the Pitch Bender Same applies to all other controls except notes If it s going to be note on off you must play the lowest note of your keyboard to be associated with CV1 With next note played CV1 will output voltage determined by MIDI note combined with PitchBender position range 2 semitones at 1V oct and Gatel will go high whenever there s any key pressed At the same time CV2 will represent the value of note Velocity 5 2 Channel and event of CV2 and Gate 2 1 press Learn button twice 2 generate MIDI event from your device connected to MIDImplant If it s going to be Modulation CV2 will be set as such with first movement of your Modulation wheel It will then follow your Modulation movement by outputting voltage proportional to what is happening
12. e values 00 standard operation lowest note at OV 61th key at 5V or less depending on scale ratio 01 reversed voltage top note at OV lowest note at 5V or less depending on scale ratio Reversed pitch voltage can only be set for V oct scales 6 8 Gate re trigger FO 00 20 7A 01 lt CV gt 08 lt re trigger gt F7 where lt CV gt is CV output selector 01 or 02 lt re trigger gt takes one of 3 possible values 00 Gate output is on as long as any note is playing 01 Gate output goes off for 0 5ms at each note on or off in legato group 02 Gate output goes off for 0 5ms in legato only when new note starts default 6 9 CV offset FO 00 20 7A 01 lt CV gt 09 lt offset gt F7 where lt CV gt is CV output selector 01 or 02 lt offset gt determines little voltage offset applied to CV output takes any value between 00 and 7F 00 most possible negative offset of about 9mV 40 no offset default state 7F most possible positive offset of about 9mV Offset is adjusted in steps of about 0 15mV and can be very usable especially in Hz V tuning where lowest notes differ only by a few mV If you use voltage buffers at CV this allows for compensation of the offsets caused by the buffers so you may use cheaper components 6 10 Reset to factory defaults Send the following System Exclusive sequences with short delays or separately to go back to default settings FO 00 20 7A 01 01 01 01 01 24 F7 notes in CV1 velocity in CV2
13. ible values 00 Gate during note on is at power supply voltage when all notes are off at OV 01 Gate during note on is at OV when all notes are off at power supply voltage 6 5 Off Velocity ignore FO 00 20 7A 01 02 05 lt off velocity gt F7 where lt off velocity gt takes one of 2 possible values 00 velocity is updated on both note on and note off events 01 velocity is updated only at note on and ignored at note off remains unchanged If your keyboard detects key release velocity CV2 by default will set the voltage according to what it gets either at at note on or note off To keep it at note s attack level use this setting 6 6 PitchBender combined with Notes FO 00 20 7A 01 lt CV gt 06 lt pbend gt F7 where lt CV gt is CV output selector 01 or 02 lt pbend gt takes one of 2 possible values 00 Pitch Bend is affecting pitch voltage default 01 pitch voltage is determined only by notes If CV is assigned to notes its voltage also varies depending on Pitch Bend of the same channel Full Bend range is 2 semitones up and down from the note s voltage If you want to use Pitch Bend for other controls or want to have full resolution Bend on 2nd CV then you should turn this feature off so the voltage stays unchanged regardless of Bender s movement 6 7 Reversed pitch voltage FO 00 20 7A 01 lt CV gt 07 lt polarity gt F7 where lt CV gt is CV output selector 01 or 02 lt polarity gt takes one of 2 possibl
14. lowing 1 press the Learn button three times 2 press a key on your MIDI keyboard to select the scale 5 lowest notes are reserved for fixed scales like Hz V while notes above set V oct scale in the following way assuming 5 octave keyboard with lowest note C C sets the scale to Hz V and 1 octave span CV range 2 4V C sets the scale to Hz V and 2 octaves span CV range 1 4V D sets the scale to Hz V and 3 octaves span CV range 0 5V 4V D sets the scale to Hz V and 4 octaves span CV range 0 25V 4V E sets the scale to Hz V and 5 octaves span CV range 0 125 4V F sets the scale to factory calibrated 1V oct with lowest pitch errors F is the low end of variable scale and sets it to about 0 47V oct top C sets 2 05V oct Any key in between lowest F and top C may be selected for different scales Middle C 25th key sets nearly 1V oct 3 if V oct was selected CV output will show the scale and it can be measured with voltmeter If for example you ve selected 1V oct by pressing 25th key it will read 1V For Hz V scale CV is set according to played note Every note played after this procedure will be converted according to newly selected scale This procedure can be repeated many times until you find proper scale You can fine tune V oct scale later but coarse setting done here should rather be slightly lower than needed because fine tuning can only increase the scale a bit as that s not fine tuning
15. n to change CV2 to something else but CV2 always becomes velocity right after programming CV1 as MIDI notes All available MIDI events represented in Control Voltage are listed below Note on off with PitchBend Note velocity possible only in CV2 Pitch Bend Continuous Controller Program Change Channel After Touch e Polyphonic After Touch Control Voltage varies from OV up to 5V It makes 61 note range for 1V oct scale If CV is configured as MIDI event different than notes OV represents lowest MIDI value and 5V is output when highest MIDI value is received All controllers are converted to voltage as one of 128 levels except Pitch Bend working with full MIDI resolution 16384 steps Neutral position of Pitch Bender gives 2 5V at the output Note on off can output 61 levels of voltage at most By default MIDI Pitch Bend affects note CV with full range of 2 semitones at 1V oct scale This can be turned off if you want to have full range Pitch Bend voltage at the other CV Bent notes cannot go below OV or above 5V so 2 lowest and 2 highest notes from 5 octave keyboard will obviously have limited bend range For note on off CV scale can be adjusted in a wide range from 0 47V oct to over 2V oct if using settings button and from 0 to 1 9V oct via Sys Ex If the scale is higher than 1V oct there is no room for 61 keys in 5V range Every note higher than that gives 5V at CV output It is possible by Sys Ex only to reverse voltage response
16. nt after CV1 is done By default the Pitch Bend wheel position is modulating CV output Maximum deviation is 2 semitones You may want to turn it off using Sys Ex command see chapter 6 6 for example if PitchBend is used to control other parameter or it is associated with CV2 6 2 V oct scale tune FO 00 20 7A 01 lt CV gt 02 lt MSB gt lt LSB gt F7 where lt CV gt is CV output selector 01 or 02 lt MSB gt is most significant byte of tuning scale Possible values 00 7F lt LSB gt is least significant byte of tuning scale Possible values 00 7F Both parameters combine to 14 bit value of tuning ratio Tuning is adjusted in steps of about 0 12mV per octave in range from 0 to 1 9 V oct The MSB LSB parameters are calculated according to the formula TUNE 8710 V oct MSB integer of TUNE 128 LSB TUNE MSB 128 for example 1 2V oct needs in decimals MSB 81 LSB 84 1V oct MSB 68 LSB 6 while 0 32V oct needs MSB 21 LSB 99 so converted to hexadecimal values it would look like this for CV1 1 2V oct FO 00 20 7A 01 01 02 51 54 F7 1V oct FO 00 20 7A 01 01 02 44 06 F7 0 32V oct FO 00 20 7A 01 01 02 15 63 F7 For each MIDImplant and each installation actual numbers needed to achieve given scale may differ slightly this is only a guideline and starting point for final tuning You should always check entire keyboard range with a tuner or frequency meter if tuning needs finer adjustments and not rely solely on this equ
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