MIDImplant - MIDI hardware
Contents
1. hexadecimal format You may use any kind of Sys Ex editor to send those commends to MIDImplant 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 indicator 01 or 02 lt channel gt is MIDI channel in range 1 16 01 10 in hex lt event gt is MIDI event from the following list 01 Note on off Program Change 02 Polyphonic Aftertouch Channel Aftertouch 03 Continuous Controller 06 Pitch Bend lt param gt meaning depends on lt event gt If it is note on off lt param gt sets the starting note of the range that MIDImplant responds If lt event gt is Continuous Controller lt param gt defines the number of CC 00 7F In other cases lt param gt is ignored If CV1 is assigned as note on off CV2 will be automaticaly set as note velocity To change this follow any procedure for CV2 assignment after CV1 is done 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 indicator 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 combined form a 14 bit value of tuning ratio Tuning is adjusted in steps of about 1mV per octave Typical 1V oct ratio is achieved when lt MSB gt 08 and lt LSB gt 45 according to the formula TUNE 102. 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 EDIT button once 2 generate MIDI event from your device connected to MIDImplant If it s going to be e g 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 according to MIDI note played and Gate1 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 EDIT button twice 2 generate MIDI event from your device connected to MIDImplant If it s going to be e g 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 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 n
3. scale in the following way assuming you use 5 octave keyboard with lowest note C C sets the scale to Hz V and 1 octave range CV range 2 5 5V C sets the scale to Hz V and 2 octaves range CV range 1 25 5V D sets the scale to Hz V and 3 octaves range CV range 0 6V 5V D sets the scale to Hz V and 4 octaves range CV range 0 3V 5V E sets the scale to Hz V and 5 octaves range CV range 0 16 5V F sets the scale to about 0 44V 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 will output the scale value and it can be measured with precision multimeter 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 scale because fine tuning can only increase the scale a bit It s not fine tuning 5 4 W 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 2 cent
4. to MIDImplant insert a MIDI plug into the socket to align contacts in their positions They are loose inside so the plug can be easier inserted If you solder the socket without a plug inside the contacts will not be perfectly aligned and plugging the MIDI cable will bend the contacts every time you plug it This in time may cause the board to crack and loose connection with the socket 3 Power supply First connect the ground input as shown in layout diagram The ground input should be connected with reasonably thick wire to star ground point usually located at the power supply The quality of ground connection directly affects the quality of generated Control Voltage It s the reference point of CV outs It can also be taken from the ground reference point of your VCO 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 15V Current drawn is less than 10mA It can be taken from any place inside the synth as long as it does not exceed 15V 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 Control voltage and gate pads are located at the edge of PCB CV outputs have impedance of 100 ohms and should be connected to a resistance greater than 10k otherwise it may be impossible to achieve full range of 5V and
5. 00 V oct 0 915 MSB integer of TUNE 128 LSB TUNE MSB 128 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 indicator 01 or 02 lt select gt takes one of 6 possible values 00 sets given CV output in V oct scale tuned by parameter described in 6 2 Values from 01 to 05 set the CV output in Hz V scale and define how many octaves are accessible 01 means that only one octave is possible and lowest voltage is 2 5V select 05 means 5 octave range and starting note gives lowest voltage of 0 16V Although MIDImplant is factory calibrated to match Hz V response within 2 cents over full 5 octave range it may be sometimes desirable to limit the number of octaves and start with higher voltage 6 4 Reset to factory defaults Send the following System Exclusive seguence to go back to default settings FO 00 20 7A 01 01 03 00 F7 FO 00 20 7A 01 02 03 00 F7 FO 00 20 7A 01 01 03 00 F7 FO 00 20 7A 01 01 01 01 01 24 F7 To set default tuning 1V oct in CV1 send the following SysEx sequence FO 00 20 7A 01 01 02 08 45 F7 after a short delay you can do it also for CV2 with this sequence FO 00 20 7A 01 02 02 08 45 F7 But you should never in any case send both sequences immediately one by one It needs at least 3ms delay between those 2 commands so if your SysEx editor does not allow for introduction of short delays send those 2 sequences separately
6. MIDImplant micro MIDI 2 CV device USER MANUAL Roman Sowa 2011 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 was designed to be mounted directly at the DIN5 socket pins but can also be installed anywhere inside your instrument if that s more feasible No mounting holes are provided The strength of connecting vires is enough to secure it in place as it weighs barely 2 grams It 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 all settings are done with use of one SPST button it s not part of the delivery any normally open switch will work More settings are accessible via MIDI System Exclusive commands MIDI System Exclusive is available in boards with firmware version 2 5 and higher The version number is indicated as 2 first digits of serial number MIDImplant board described here is a product of MIDI hardware Roman Sowa ul Azotowa 15B 41 503 Chorzow Poland phone 48 32 7633 931 email info midimplant com 2011 Roman Sowa made in Poland E
7. U 2 Layout Pictures below show how to locate the soldering pads in MIDImplant board and depicts their role They are e 2 Control Voltage outputs Power supply 2 Gate outputs GND 6 15V EDIT input power supply input ground me cs e setup EDIT button input gt group of pads for connecting MIDI a 2 IN DINS socket s2 The EDIT button should be connected to Ta r OF MIDI IN the pad indicated in the picture with 2nd Ge 7 DIN 5 lead connected to ground You don t need ER to connect it at all if SysEx will be used or 9 P DIN 4 if default setting is OK channel 1 starting note C MIDI 36 1V oct velocity on CV2 The board has no holes for mounting screws Instead it can be soldered directly to DIN5 socket Synthesizers usually have enough space behind back panel to fit it inside Total length from MIDI socket face to the back of the board is less than 2 5cm MIDI IN signal should be connected to pads on the bottom marked above as DIN 4 and DIN 5 If the board will be mounted directly on DIN socket pins you should solder the board to unconnected rectangle pads on the top side This is enough for securing it in place Then use short pieces of wire to solder DIN contacts 4 and 5 to rectangle pads at the bottom This is shown in drawing below Middle pin of DIN socket number 2 must not be connected anywhere it must be left open to comply with MIDI specification Before you start to solder the socket
8. maintain precision Usually CV inputs have 100k impedance so it s perfectly OK Gate outputs use transistor buffer with pull up resistor Gate on is represented with the same voltage as power supply 6 15V 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 then 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 Note velocity possible only in CV2 Pitch Bend Continuous Controller Program Change Channel After Touch 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 represented in voltage as one of 128 levels except Pitch Bend working with full 14 bit resolution 16384 steps Neutral position of PitchBender gives 2 5V on MIDImplant output Note on off can output 61 levels of voltage at most For note on off CV scale can be adjusted in a wide range from 0 44V oct to over 2V oct if using settings button and much wider via SysEx When configured in H
9. ote played CV2 will output voltage according to MIDI note played and Gate2 will go high whenever there s any note pressed You should never assign the same keyboard to both channels CV1 and CV2 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 means of EDIT 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 you must use SysEx 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 done do the following 1 press the EDIT button three times 2 press a key on your MIDI keyboard to select the scale 5 lowest notes are reserved for Hz V while notes above set V oct
10. s of tuning error over entire keyboard range and cannot be fine tuned To enter fine tuning mode do the following 1 press the EDIT 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 precision multimeter 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 Top 61th key may have a small error in voltage and it should not be used for measuring actual scale There may be greater tuning error at the 61th key To avoid that you may lower the MIDImplant s V oct ratio by 1 2mV oct and compensate it with your VCO trimmer 6 User settings via System Exclusive All settings described in chapter 5 are accessible via MIDI System Exclusive messages Sys Ex is also the only way to set them separately for each CV output The command s structure is as follows SysEx header FO manufacturer ID 00 20 7A device ID 01 CV output ID 01 02 command 01 03 its parameters and Sys Ex footer F7 This is described in details here All numbers are represented in
11. z V scale the voltage reaches 5V at the top note This is described in chapter about tuning 5 3 5 4 If the scale is higher than 1V oct there is of course no room for 61 keys in 5V range so it is limited to lower number of keys Every note higher than this limit gives 5V at CV output 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 nearly OV until any note is played It then goes up to the supply voltage level and stays there until all notes are released It is typical V trigger mode This is only true when CV output is configured for MIDI notes In all other cases gate output remains at nearly OV 5 User settings with EDIT 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 have EDIT button connected see the layout There are only 4 parameters to set 1 channel and MIDI event for CV1 gate1 2 channel and MIDI event for CV2 gate2 3 Keyboard scale select common for both CV 4 V oct fine tuning common for both CV 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 scale select or 4 times to fine tune the scale There s no time limit for pressing the EDIT button several times But don t push
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