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November 1, 2025 22:39
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Novation Circuit Tracks chromatic sample playback with MIDI.
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| #include <MIDI.h> | |
| #define MidiInChannel 3 //default setting of MIDI 1 out channel for circuit tracks | |
| #define MidiDrumChannel 10 //drum 1 channel, other drums on 61,62,63 | |
| #define MidiDrumNote 60 //drum 1 channel, other drums on 61,62,63 | |
| #define pitchRelativeTo 60 //sample is unpitched for c4 = midi note 60 | |
| const float twelfthRootOfTwo = 1.0594631; //frequency ratio between adjacent semitones | |
| MIDI_CREATE_INSTANCE(HardwareSerial, Serial1, MIDI); | |
| void callbackNoteOn(byte channel, byte pitch, byte velocity){ | |
| if (channel == MidiInChannel){ | |
| float desiredFreqMul = pow(twelfthRootOfTwo,((int16_t)pitch - pitchRelativeTo)); | |
| Serial.println(desiredFreqMul); | |
| float drumPitch = (4*desiredFreqMul-1)*64/3; | |
| Serial.println(drumPitch); | |
| //clip float | |
| if (drumPitch < 0.0){ | |
| drumPitch = 0; | |
| } | |
| if (drumPitch > 127.0){ | |
| drumPitch = 127; | |
| } | |
| MIDI.sendControlChange(14, (char)drumPitch, MidiDrumChannel); | |
| MIDI.sendNoteOn(MidiDrumNote, velocity, MidiDrumChannel); | |
| Serial.println("noteon"); | |
| } | |
| } | |
| void callbackNoteOff(byte channel, byte pitch, byte velocity){ | |
| if (channel == MidiInChannel){ | |
| MIDI.sendNoteOff(MidiDrumNote, velocity, MidiDrumChannel); | |
| Serial.println("noteoff"); | |
| } | |
| } | |
| void setup() { | |
| Serial.begin(115200); | |
| Serial.println("MIDI GO!"); | |
| MIDI.begin(MIDI_CHANNEL_OMNI); | |
| MIDI.turnThruOff(); | |
| MIDI.setHandleNoteOn(callbackNoteOn); | |
| MIDI.setHandleNoteOff(callbackNoteOff); | |
| } | |
| void loop() { | |
| MIDI.read(); | |
| } |
Author
Measured pitch shifting, notice the stairstepping artifacts and the limited precision for the lower octave notes:
Author
Approximation formula (4*freqMul-1)*64/3 vs measured values. Some of the uneven CC14 values seem to be shifted, maybe because of the way the circuit calculated the shift internally?
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