// Minimoog - Teensy /* * This program is part of a minimoog-like synthesizer based on teensy 4.0 * Copyright (C) 2020 Pierre-Loup Martin * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ /* This program is a synthesizer very similar to the minimoog model D. * It is intended to run on a Teensy 4.0, using the PJRC audio library. * It also uses two Arduino Mega boards to manage all the user inputs : * keyboard, switches, potentiometers, etc. * All user inputs are handled and send to the teensy board using midi commands */ /* * Pinout * * RX from mega 1 (through tension divider) 0 * TX to mega 1 (serial 1) 1 * mega 1 reset 2 * * RX from mega 2 (through tension divider) 16 * TX to mega 2 (serial 4) 17 * mega 2 reset 18 * * I2S OUT1A 7 * I2S LRCLK1 20 * I2S BCLK1 21 * * There are provision on the rear panel for sustain and expression control, not implemented yet. */ #include #include #include #include #include #include #include "audio_setup.h" #include "defs.h" #include "MIDI.h" #include "Timer.h" // constants // my pots never go full clockwise... :/ So this can be used to adapt their range. const uint16_t RESO = 1005; const uint16_t HALF_RESO = RESO / 2; // There is a function that handles and tracks the key presses. Here is the max. // It can me more, but whith ten fingers on a monophonic synth, I think this is enough ! const uint8_t KEYTRACK_MAX = 10; // Mega1 sends midi note 0 for the lower note ; we offset it by for octave to get into the usefull range const uint8_t MIDI_OFFSET = 48; // To be modified according to keybed used. It's actualy not used, and any note can be handled from MIDI in. const uint8_t NUM_KEYS = 30; // Octave range for oscillators and filter. const uint8_t MAX_OCTAVE = 10; const uint8_t FILTER_MAX_OCTAVE = 5; // The base for computing DC levels for keys, modulation, pitchbend, etc. const float NOTE_MIDI_0 = 8.1757989156434; const float NOTE_RATIO = 1.0594630943593; const float HALFTONE_TO_DC = (float)1 / (MAX_OCTAVE * 12); const float FILTER_HALFTONE_TO_DC = (float)1 / (FILTER_MAX_OCTAVE * 12); // Filter base frequency : the filter cutoff frequency varies around this value. const float FILTER_BASE_FREQUENCY = 440.0; const float FILTER_BASE_NOTE = (log(FILTER_BASE_FREQUENCY / NOTE_MIDI_0)) / (log(NOTE_RATIO)); // This corresponds to the min and max values for the variable filter available in the Teensy Audio library, // which is used by the synth. /* Note about the state variable (Chamberlin) filter: * This filter can self oscillate, if given a resonnance value of around 50000. * (and the library modified to accept such value ; the setter limits it to 5). * It gives a nice sounding, pure sinewave. * Problem is, usefull range for varying resonnace is about what the bare library allows (from 0.7 to 5). * It would be nice to test some exponential course to enable both continuous resonance modification AND self-oscillation. * I've tried some modifications, but couldn't come to something usable. */ const float FILTER_MIN_Q = 0.7; const float FILTER_MAX_Q = 5; const float FILTER_DIV_Q = RESO / (FILTER_MAX_Q - FILTER_MIN_Q); // Max mixer value for eahc channel if we want to avoid clipping. // Value of 1 can be used, but induces distortion when more than one oscillator is used. // Feedback should have its own value. If MAX_MIX is one feedback is powerfull, // but with this value the difference with and without feedback is barrely noticeable. const float MAX_MIX = 0.32; // To be put in Mega1 sketch, so it sends a value on 14 bits. // Note : the pitchbend wheel poses problems on the other sketch. For now it will stay like that, // but there is room for improvement. //343 - 492 - 500 - 651 const int16_t PITCH_BEND_MIN = 343; const int16_t PITCH_BEND_MAX = 651; const int16_t PITCH_BEND_NEUTRAL = PITCH_BEND_MIN + (PITCH_BEND_MAX - PITCH_BEND_MIN) / 2; const int16_t PITCH_BEND_COURSE = PITCH_BEND_MAX - PITCH_BEND_MIN; const float PITCH_BEND_INTERNAL_TO_MIDI = 8192.0 / PITCH_BEND_COURSE; // Maximum attack, decay, release and glide time (in milliseconds) // These use an exponential course to have both fine-tune of low values and a great range. const float MAX_ATTACK_TIME = 10000; const float MAX_DECAY_TIME = 10000; const float MAX_RELEASE_TIME = 10000; const float MAX_GLIDE_TIME = 10000; /* // Moved to Mega 1 const uint16_t MOD_WHEEL_MIN = 360; const uint16_t MOD_WHEEL_MAX = 666; const uint16_t MOD_WHEEL_NEUTRAL = MOD_WHEEL_MIN + (MOD_WHEEL_MAX - MOD_WHEEL_MIN) / 2; const uint16_t MOD_WHEEL_COURSE = MOD_WHEEL_MAX - MOD_WHEEL_MIN; */ // Teensy can reset both Mega, if needed. const uint8_t MEGA1_RST = 2; const uint8_t MEGA2_RST = 18; // Addresses for settings storing in memory. It uses Arduino's EEPROM functions but is saved to RAM on Teensy 4.0. const uint16_t EE_BITCRUSH_ADD = 0; const uint16_t EE_KEYBOARD_MODE_ADD = 1; const uint16_t EE_MIDI_IN_CH_ADD = 2; const uint16_t EE_MIDI_OUT_CH_ADD = 3; const uint16_t EE_TRIGGER_ADD = 4; const uint16_t EE_DETUNE_ADD = 5; const uint16_t EE_FILTER_MODE = 6; const uint16_t EE_PITCH_BEND_RANGE = 7; const uint16_t EE_MOD_WHEEL_OSC_RANGE = 8; const uint16_t EE_MOD_WHEEL_FILTER_RANGE = 9; const uint16_t EE_DETUNE_TABLE_ADD = 20; // variables // Note : uint8_t internalMidiChannel = 1; uint8_t midiInChannel = 1; uint8_t midiOutChannel = 1; float glide = 0; bool glideEn = 0; bool noteRetrigger = 1; bool filterKeyTrack1 = 0; bool filterKeyTrack2 = 0; int8_t transpose = 0; bool function = 0; bool oscMod = 0; bool decay = 0; // note : not used. It was intended to copy decay to release as on the orignal minimoog, // but a release pot is present here. // Anyway, the code is there, commented out, and there is a CC for it. float filterDecay = 0; float egDecay = 0; // Stores the current band value, for recall when the band mode is changed. int16_t filterBandValue = 0; uint8_t pitchBendRange = 3; uint8_t modWheelOscRange = 3; uint8_t modWheelFilterRange = 12; // Waveforms uint8_t waveforms[6] = {WAVEFORM_SINE, WAVEFORM_TRIANGLE, WAVEFORM_SAWTOOTH, WAVEFORM_SAWTOOTH_REVERSE, WAVEFORM_SQUARE, WAVEFORM_PULSE}; // detune table. For emulating resistor-ladder keybed and induce key detuning. float detuneTable[128]; // keyTrack /* * Note on keytrack : there are two "keytracks" on the synth. * One is the filter keytrack, that reflects the note being played on the filter's cutoff frequency. * The other (this one) is a system tracks key being pressed to send not according to note priority setting. * A better name for one or the other should be found... */ uint8_t keyTrackIndex = 0; struct { uint8_t key; uint8_t velocity; } keyTrack[KEYTRACK_MAX]; int8_t nowPlaying = -1; // double CC track uint8_t ccTempValue[32]; enum function_t{ FUNCTION_KEYBOARD_MODE = 0, FUNCTION_RETRIGGER, FUNCTION_DETUNE, FUNCTION_BITCRUSH, FUNCTION_FILTER_MODE, FUNCTION_MIDI_IN_CHANNEL, FUNCTION_MIDI_OUT_CHANNEL, FUNCTION_PITCH_BEND_RANGE, FUNCTION_MOD_WHEEL_OSC_RANGE, FUNCTION_MOD_WHEEL_FILTER_RANGE, }; function_t currentFunction = FUNCTION_KEYBOARD_MODE; enum keyMode_t{ KEY_LOWER = 0, KEY_FIRST, KEY_LAST, KEY_UPPER, }; keyMode_t keyMode = KEY_LAST; enum detune_t{ DETUNE_OFF = 0, DETUNE_SOFT, DETUNE_MEDIUM, DETUNE_HARD, DETUNE_RESET, }; detune_t detune = DETUNE_OFF; float detuneCoeff[4] = {0, 0.1, 0.3, 0.5}; enum filterMode_t{ FILTER_BAND_PASS = 0, FILTER_BAND_STOP, }; filterMode_t filterMode = FILTER_BAND_PASS; uint8_t bitCrushLevel = 16; struct midiSettings : public midi::DefaultSettings{ // static const bool UseRunningStatus = true; static const long BaudRate = 115200; }; // USB midi for sending and receiving to and from other device or computer. MIDI_CREATE_DEFAULT_INSTANCE(); // The ones we use on synth for internal communication between Mega and Teensy MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial1, midi1, midiSettings); MIDI_CREATE_CUSTOM_INSTANCE(HardwareSerial, Serial4, midi2, midiSettings); // for debug purpose, to send to serial the CPU used by audio library. // Timer timerCPU; // Timer timerGraph; void setup() { pinMode(13, OUTPUT); digitalWrite(13, 1); // Mega resets pinMode(MEGA1_RST, OUTPUT); pinMode(MEGA2_RST, OUTPUT); digitalWrite(MEGA1_RST, 1); digitalWrite(MEGA2_RST, 1); // midi settings, start and callback midi1.begin(1); midi1.turnThruOff(); midi1.setHandleNoteOn(handleInternalNoteOn); midi1.setHandleNoteOff(handleInternalNoteOff); midi1.setHandlePitchBend(handleInternalPitchBend); midi1.setHandleControlChange(handleControlChange); midi2.begin(1); midi2.turnThruOff(); midi2.setHandleControlChange(handleControlChange); /* Serial.begin(115200); Serial.println("started..."); */ // Getting the settings from "eeprom" EEPROM.get(EE_BITCRUSH_ADD, bitCrushLevel); EEPROM.get(EE_KEYBOARD_MODE_ADD, keyMode); EEPROM.get(EE_MIDI_IN_CH_ADD, midiInChannel); EEPROM.get(EE_MIDI_OUT_CH_ADD, midiOutChannel); EEPROM.get(EE_TRIGGER_ADD, noteRetrigger); EEPROM.get(EE_DETUNE_ADD, detune); EEPROM.get(EE_FILTER_MODE, filterMode); EEPROM.get(EE_MOD_WHEEL_OSC_RANGE, modWheelOscRange); EEPROM.get(EE_MOD_WHEEL_FILTER_RANGE, modWheelFilterRange); uint16_t address = EE_DETUNE_TABLE_ADD; for(uint16_t i = 0; i < 128; ++i){ EEPROM.get(address, detuneTable[i]); address += 4; } // TODO : check how to receive and transmit on different channels. usbMIDI.setHandleNoteOn(handleNoteOn); usbMIDI.setHandleNoteOff(handleNoteOff); usbMIDI.setHandlePitchChange(handlePitchBend); usbMIDI.begin(); AudioMemory(200); // audio settings // dc dcKeyTrack.amplitude(0.0); dcPitchBend.amplitude(0.0); dcFilterEnvelope.amplitude(1.0); dcFilter.amplitude(0.0); dcFilterKeyTrack.amplitude(0.0); dcOsc3.amplitude(0.2); dcLfoFreq.amplitude(0.0); dcOscTune.amplitude(0.0); dcOsc2Tune.amplitude(0.0); dcOsc3Tune.amplitude(0.0); dcPulse.amplitude(-0.95); // amp ampPitchBend.gain(pitchBendRange * HALFTONE_TO_DC * 2); ampModWheelOsc.gain(0.0); ampModWheelFilter.gain(0.0); ampPreFilter.gain(1.0); ampModEg.gain(0.1); ampOsc3Mod.gain(1); masterVolume.gain(1.0); osc1Waveform.frequencyModulation(MAX_OCTAVE); osc2Waveform.frequencyModulation(MAX_OCTAVE); osc3Waveform.frequencyModulation(MAX_OCTAVE); osc1Waveform.begin(1, NOTE_MIDI_0, WAVEFORM_TRIANGLE); osc2Waveform.begin(1, NOTE_MIDI_0, WAVEFORM_SAWTOOTH); osc3Waveform.begin(1, NOTE_MIDI_0, WAVEFORM_SQUARE); // noise whiteNoise.amplitude(1); pinkNoise.amplitude(1); // LFO lfoWaveform.begin(1, 0.1, WAVEFORM_TRIANGLE); lfoWaveform.frequencyModulation(11); // mixers mainTuneMixer.gain(0, 1); mainTuneMixer.gain(1, 1); mainTuneMixer.gain(2, 1); mainTuneMixer.gain(3, 1); osc2TuneMixer.gain(0, 1); osc2TuneMixer.gain(1, 1); osc3TuneMixer.gain(0, 1); osc3TuneMixer.gain(1, 1); oscMixer.gain(0, 1); oscMixer.gain(1, 0); oscMixer.gain(2, 0); oscMixer.gain(3, 0); globalMixer.gain(0, 1); globalMixer.gain(1, 0); globalMixer.gain(2, 1); noiseMixer.gain(0, 1); noiseMixer.gain(1, 0); osc3ControlMixer.gain(0, 1); osc3ControlMixer.gain(1, 0); modMix1.gain(0, 0); modMix1.gain(1, 1); modMix2.gain(0, 1); modMix2.gain(1, 0); modMixer.gain(0, 1); modMixer.gain(1, 0); filterMixer.gain(0, 0); filterMixer.gain(1, 0); filterMixer.gain(2, 1); filterMixer.gain(3, 0); bandMixer.gain(0, 1); bandMixer.gain(1, 0); bandMixer.gain(2, 0); // filter vcf.frequency(FILTER_BASE_FREQUENCY); vcf.resonance(0.7); vcf.octaveControl(FILTER_MAX_OCTAVE); // envelopes mainEnvelope.delay(0); mainEnvelope.attack(10); mainEnvelope.hold(0); mainEnvelope.decay(25); mainEnvelope.sustain(0.9); mainEnvelope.release(100); filterEnvelope.delay(0); filterEnvelope.attack(200); filterEnvelope.hold(0); filterEnvelope.decay(100); filterEnvelope.sustain(0.8); filterEnvelope.release(50); bitCrushOutput.bits(16); bitCrushOutput.sampleRate(44100.0); delay(500); digitalWrite(13, 0); delay(200); // Blink. For debug. And letting a bit more time to Mega 1 to start. for(uint8_t i = 0; i < 5; ++i){ digitalWrite(13, 1); delay(100); digitalWrite(13, 0); delay(50); } // Serial.println("asking for all controls"); midi1.sendControlChange(CC_ASK_FOR_DATA, 127, 1); midi2.sendControlChange(CC_ASK_FOR_DATA, 127, 1); /* timerCPU.init(); timerCPU.setDelay(500); timerCPU.start(Timer::LOOP); Serial.print("max CPU usage"); Serial.println(AudioProcessorUsageMax()); */ /* timerGraph.init(); timerGraph.setDelay(2); timerGraph.start(Timer::LOOP); printPostFilter.length(1); */ } void loop() { midi1.read(); midi2.read(); usbMIDI.read(midiInChannel); /* if(timerCPU.update()){ Serial.print("cpu usage :"); Serial.println(AudioProcessorUsage()); } */ /* if(peakPreFilter.available()){ Serial.print("pre filter :\t"); Serial.println(peakPreFilter.read()); } */ /* if(peakPostFilter.available()){ Serial.print("post filter :\t"); Serial.println(peakPostFilter.read()); } */ // if(timerGraph.update()) printPostFilter.trigger(); } // handle note on. compute dc to waveforms, glide enveloppe triggering, etc. void noteOn(uint8_t note, uint8_t velocity, bool trigger = 1){ /* Serial.print("playing :"); Serial.println(note); */ // Note tracking. nowPlaying = note; // Applying detune per key. float fineTune = detuneTable[note] * detuneCoeff[detune]; // float duration = 1.0 + (float)glideEn * (float)glide * 3.75; float duration = 1.0 + (float)glideEn * glide * MAX_GLIDE_TIME; float level = ((float)note + 12 * transpose) * HALFTONE_TO_DC; level += fineTune; // filter level is for cutoff freqeuncy keytrack. It's computed anyway, but enable through the corresponding mixer. float filterLevel = (((float)note - FILTER_BASE_NOTE) + (12 * transpose)) * FILTER_HALFTONE_TO_DC; filterLevel += fineTune; AudioNoInterrupts(); dcKeyTrack.amplitude(level, duration); dcFilterKeyTrack.amplitude(filterLevel, duration); if(trigger){ filterEnvelope.noteOn(); mainEnvelope.noteOn(); } AudioInterrupts(); } // Stop note. void noteOff(){ AudioNoInterrupts(); filterEnvelope.noteOff(); mainEnvelope.noteOff(); AudioInterrupts(); } // Keytrack functions // This one check if the key is the lower one, or not, and returns the index of the lower one. int8_t keyTrackGetLower(uint8_t note){ uint8_t lower = 127; int8_t lowerIndex = keyTrackIndex - 1; for(uint8_t i = 0; i < keyTrackIndex; ++i){ if(keyTrack[i].key < lower){ lower = keyTrack[i].key; lowerIndex = i; } } /* Serial.print("lower note : "); Serial.print(lower); Serial.print("\t index : "); Serial.println(lowerIndex); */ return lowerIndex; } // Ditto upper key. int8_t keyTrackGetUpper(uint8_t note){ uint8_t upper = 0; int8_t upperIndex = keyTrackIndex - 1; for(uint8_t i = 0; i < keyTrackIndex; ++i){ if(keyTrack[i].key > upper){ upper = keyTrack[i].key; upperIndex = i; } } /* Serial.print("upper note : "); Serial.print(upper); Serial.print("\t index : "); Serial.println(upperIndex); */ return upperIndex; } // Add a key to the keytrack table. int8_t keyTrackAdd(uint8_t note, uint8_t velocity){ // We only keep count of a limited quantity of notes ! if (keyTrackIndex >= KEYTRACK_MAX) return -1; /* Serial.print("note added : "); Serial.print(note); Serial.print("\t index : "); Serial.println(keyTrackIndex); */ keyTrack[keyTrackIndex].key = note; keyTrack[keyTrackIndex].velocity = velocity; return keyTrackIndex++; } // remove a key that has been released on the keyboard, and reorder all that were pressed after. int8_t keyTrackRemove(uint8_t note){ int8_t update = -1; for(uint8_t i = 0; i < keyTrackIndex; ++i){ if(keyTrack[i].key == note){ update = i; keyTrackIndex--; break; } } if(update >= 0){ /* Serial.print("note removed : "); Serial.print(note); Serial.print("\t index : "); Serial.println(update); */ for(uint8_t i = update; i < keyTrackIndex; ++i){ keyTrack[i] = keyTrack[i + 1]; } } return update; } // Handle note on. Internal MIDI from Mega 1 lands here. // Dispatch to settings if the function switch is enable. // Apply the keyboard offset (Mega 1 has its first key corresponding to MIDI note 0) // Echo the offset note to usbMIDI out. void handleInternalNoteOn(uint8_t channel, uint8_t note, uint8_t velocity){ if(function){ handleKeyboardFunction(note, 1); return; } usbMIDI.sendNoteOn(note + MIDI_OFFSET + 12 * transpose, velocity, midiOutChannel); handleNoteOn(channel, note + MIDI_OFFSET, velocity); } // Handle note ON. usbMIDI in lands here. // Define if the new note has to be played, according to notes already played and key priority. void handleNoteOn(uint8_t channel, uint8_t note, uint8_t velocity){ /* Serial.print("note "); Serial.print(note); Serial.println(" on"); */ int8_t newIndex = -1; int8_t lowerIndex = -1; int8_t upperIndex = -1; switch(keyMode){ // When KEY_FIRST, we play the note only if there is not one already playing // But we keep track of all notes depressed ! case KEY_FIRST: if(keyTrackAdd(note, velocity) == 0) noteOn(note, velocity); break; // When KEY_LAST, we play the new note anyway. // And keep track. Of course. case KEY_LAST: // if(keyTrackAdd(note, velocity) >= 0) noteOn(note, velocity); newIndex = keyTrackAdd(note, velocity); if(newIndex == 0){ noteOn(note, velocity, 1); } else if(newIndex > 0){ noteOn(note, velocity, noteRetrigger); } break; case KEY_LOWER: // add note to the keytrack table. // check if there is a lower one. // if no, play the note. // if yes, do nothing. // Serial.println("handle note on"); newIndex = keyTrackAdd(note, velocity); lowerIndex = keyTrackGetLower(note); /* Serial.print("new : "); Serial.print(newIndex); Serial.print("\tlower : "); Serial.println(lowerIndex); */ if(lowerIndex == (keyTrackIndex - 1)){ if(newIndex == 0){ noteOn(note, velocity); } else if(newIndex > 0){ noteOn(note, velocity, noteRetrigger); } } break; case KEY_UPPER: // add note to the keytrack table. // check if there is an upper one. // If no, play the note. // If yes, do nothing. newIndex = keyTrackAdd(note, velocity); upperIndex = keyTrackGetUpper(note); if(upperIndex == (keyTrackIndex - 1)){ if(newIndex == 0){ noteOn(note, velocity); } else if(newIndex > 0){ noteOn(note, velocity, noteRetrigger); } } break; default: break; } } // handle internal note off. // Apply offset from keyboard, echo to usb MIDI out. void handleInternalNoteOff(uint8_t channel, uint8_t note, uint8_t velocity){ if(function){ // handleKeyboardFunction(note, 0); return; } usbMIDI.sendNoteOff(note + MIDI_OFFSET + 12 * transpose, 0, midiOutChannel); handleNoteOff(channel, note + MIDI_OFFSET, velocity); } // Handle note off. // usbMIDI in lands here. // Manage note priority, i.e. stopping the note released and re-triggering the previous one if needed. void handleNoteOff(uint8_t channel, uint8_t note, uint8_t velocity){ /* Serial.print("note "); Serial.print(note); Serial.println(" off"); */ int8_t lowerIndex = -1; int8_t upperIndex = -1; int8_t newIndex = -1; switch(keyMode){ case KEY_FIRST: if(keyTrackRemove(note) == 0){ if(keyTrackIndex > 0){ noteOn(keyTrack[0].key, keyTrack[0].velocity, noteRetrigger); } else { noteOff(); } } break; case KEY_LAST: if(keyTrackRemove(note) == keyTrackIndex){ if(keyTrackIndex > 0){ noteOn(keyTrack[keyTrackIndex - 1].key, keyTrack[keyTrackIndex - 1].velocity, noteRetrigger); } else { noteOff(); } } break; case KEY_LOWER: // check the keytrack table and remove the note of it. // compare it to other notes. // if there is no, send note off. // if there is a lower, do nothing. // if there is an upper, play the new lower note. // Serial.println("handle note off"); lowerIndex = keyTrackGetLower(note); newIndex = keyTrackRemove(note); /* Serial.print("new : "); Serial.print(newIndex); Serial.print("\tlower : "); Serial.println(lowerIndex); */ if(newIndex == lowerIndex){ if(keyTrackIndex == 0){ noteOff(); } else { lowerIndex = keyTrackGetLower(note); noteOn(keyTrack[lowerIndex].key, keyTrack[lowerIndex].velocity, noteRetrigger); } } break; case KEY_UPPER: upperIndex = keyTrackGetUpper(note); newIndex = keyTrackRemove(note); if(newIndex == upperIndex){ if(keyTrackIndex == 0){ noteOff(); } else { upperIndex = keyTrackGetUpper(note); noteOn(keyTrack[upperIndex].key, keyTrack[upperIndex].velocity, noteRetrigger); } } break; default: break; } } // internal pitch bend from Mega 1. // Echo to usb MIDI out. // Still work to do here, as there is still this bug on Mega 1 side. void handleInternalPitchBend(uint8_t channel, int16_t bend){ if(function) handlePitchBendFunction(); int16_t bendAmount = (bend - PITCH_BEND_NEUTRAL) * PITCH_BEND_INTERNAL_TO_MIDI; handlePitchBend(channel, bendAmount); usbMIDI.sendPitchBend(bendAmount, midiOutChannel); /* Serial.print("pitch bend :"); Serial.println(bend); */ } // Pitch bend from usb MIDI in lands here. void handlePitchBend(uint8_t channel, int16_t bend){ dcPitchBend.amplitude(((float)bend) / 8190); // neutral at -11 from u(bend - PITCH_BEND_NEUTRAL) * PITCH_BEND_INTERNAL_TO_MIDIp, -24 from down. :/ } // Handle internal control changes, and probably some from outside // all notes off is the only one implemented for now from usb MIDI in. // Dispatch to settings when the function switch is on. void handleControlChange(uint8_t channel, uint8_t command, uint8_t value){ if(function){ handleCCFunction(command, value); return; } /* Serial.print("control change "); Serial.println(command); */ // Long value reconstruct the 14-bits value send with CC 0-31, associated to CC LSB 32-63. // Ramp value is used for glide, attack, decay and release, which have exponential settings. // Short times can be precisely set, but longer are available as well. uint16_t longValue = 0; float rampValue = 0; if(command < 32){ ccTempValue[command] = value; /* Serial.print("value : "); Serial.print(value << 7); Serial.print(" (sent : "); Serial.print(value); Serial.println(')'); */ } else if(command < 64){ longValue = (uint16_t)ccTempValue[command - 32]; longValue <<= 7; longValue += value; rampValue = pow((float)longValue / RESO, 2); /* Serial.print("value : "); Serial.println(longValue); Serial.print("ramp value : "); Serial.println(rampValue * 1000); Serial.println(); */ } else { /* Serial.print("value : "); Serial.println(value); */ } // The first 32 CC are empty, has we wait for the associated LSB CC to apply the whole value at once. switch(command){ case CC_MOD_WHEEL: // CC_1 break; case CC_MODULATION_MIX: // CC_3 break; case CC_PORTAMENTO_TIME: // CC_5 break; case CC_CHANNEL_VOL: // CC_7 break; case CC_OSC_TUNE: // CC_9 break; case CC_OSC2_TUNE: // CC_12 break; case CC_OSC3_TUNE: // CC_13 break; case CC_OSC1_MIX: // CC_14 break; case CC_OSC2_MIX: // CC_15 break; case CC_OSC3_MIX: // CC_16 break; case CC_NOISE_MIX: // CC_17 break; case CC_FEEDBACK_MIX: // CC_18 break; case CC_FILTER_BAND: // CC_19 break; case CC_FILTER_CUTOFF_FREQ: // CC_20 // vcf.frequency((float)value * 32); break; case CC_FILTER_EMPHASIS: // CC_21 break; case CC_FILTER_CONTOUR: // CC_22 break; case CC_FILTER_ATTACK: // CC_23 break; case CC_FILTER_DECAY: // CC_24 break; case CC_FILTER_SUSTAIN: // CC_25 break; case CC_FILTER_RELEASE: // CC_26 break; case CC_EG_ATTACK: // CC_27 break; case CC_EG_DECAY: // CC_28 break; case CC_EG_SUSTAIN: // CC_29 break; case CC_LFO_RATE: // CC_31 break; case CC_MOD_WHEEL_LSB: // CC_33 // ampModWheelOsc.gain(((float)longValue - 1 - MOD_WHEEL_MIN) / 12 / MOD_WHEEL_COURSE); ampModWheelOsc.gain(((float)(longValue * modWheelOscRange)) / MAX_OCTAVE / 12 / 16384); ampModWheelFilter.gain(((float)(longValue * modWheelFilterRange)) / FILTER_MAX_OCTAVE / 12 / 16384); // Mod wheel goes from 360 to 666. /* Serial.print("mod wheel : "); Serial.println(longValue); */ break; case CC_MODULATION_MIX_LSB: // CC_35 AudioNoInterrupts(); modMixer.gain(0, (float)longValue / RESO); modMixer.gain(1, (RESO - (float)longValue) / RESO); AudioInterrupts(); break; case CC_PORTAMENTO_TIME_LSB: // CC_37 // glide = longValue; glide = rampValue; break; case CC_CHANNEL_VOL_LSB: // CC_39 masterVolume.gain((float)longValue / RESO); break; case CC_OSC_TUNE_LSB: // CC_41 dcOscTune.amplitude(HALFTONE_TO_DC * 2 * ((float)longValue - HALF_RESO) / RESO); break; case CC_OSC2_TUNE_LSB: // CC_44 dcOsc2Tune.amplitude(HALFTONE_TO_DC * 12 * 2 * ((float)longValue - HALF_RESO) / RESO); break; case CC_OSC3_TUNE_LSB: // CC_45 dcOsc3Tune.amplitude(HALFTONE_TO_DC * 12 * 2 * ((float)longValue - HALF_RESO) / RESO); break; case CC_OSC1_MIX_LSB: // CC_46 oscMixer.gain(0, MAX_MIX * (float)longValue / RESO); break; case CC_OSC2_MIX_LSB: // CC_47 oscMixer.gain(1, MAX_MIX * (float)longValue / RESO); break; case CC_OSC3_MIX_LSB: // CC_48 oscMixer.gain(2, MAX_MIX * (float)longValue / RESO); break; case CC_NOISE_MIX_LSB: // CC_49 oscMixer.gain(3, MAX_MIX * (float)longValue / RESO); break; case CC_FEEDBACK_MIX_LSB: // CC_50 globalMixer.gain(1, MAX_MIX * (float)longValue / RESO); break; case CC_FILTER_BAND_LSB: // CC_51 filterBandValue = longValue; AudioNoInterrupts(); if(filterMode == FILTER_BAND_PASS){ if(longValue < HALF_RESO){ bandMixer.gain(0, ((float)HALF_RESO - (float)longValue) / HALF_RESO); bandMixer.gain(1, (float)longValue / HALF_RESO); bandMixer.gain(2, 0.0); } else { bandMixer.gain(0, 0.0); bandMixer.gain(1, ((float)RESO - (float)longValue) / HALF_RESO); bandMixer.gain(2, ((float)longValue - HALF_RESO) / HALF_RESO); } } else if(filterMode == FILTER_BAND_STOP){ bandMixer.gain(0, (float)(RESO - longValue) / RESO); bandMixer.gain(1, 0.0); bandMixer.gain(2, (float)longValue / RESO); } AudioInterrupts(); break; case CC_FILTER_CUTOFF_FREQ_LSB: // CC_52 dcFilter.amplitude(((float)longValue - HALF_RESO) / HALF_RESO); break; case CC_FILTER_EMPHASIS_LSB: // CC_53 vcf.resonance(FILTER_MIN_Q + (float)longValue / FILTER_DIV_Q); break; case CC_FILTER_CONTOUR_LSB: // CC_54 // filterMixer.gain(1, (float)longValue / RESO); filterMixer.gain(1, (float)(longValue - HALF_RESO) / RESO); break; case CC_FILTER_ATTACK_LSB: // CC_55 // original : linear attack // filterEnvelope.attack(1 + (float)longValue * 5.0); filterEnvelope.attack(rampValue * MAX_ATTACK_TIME); break; case CC_FILTER_DECAY_LSB: // CC_56 // filterEnvelope.decay((float)longValue * 5.0); filterEnvelope.decay(rampValue * MAX_ATTACK_TIME); break; case CC_FILTER_SUSTAIN_LSB: // CC_57 filterEnvelope.sustain((float)longValue / RESO); break; case CC_FILTER_RELEASE_LSB: // CC_58 // filterEnvelope.release(1 + (float)longValue * 5.0); filterEnvelope.release(rampValue * MAX_ATTACK_TIME); break; case CC_EG_ATTACK_LSB: // CC_59 // mainEnvelope.attack(1 + (float)longValue * 5.0); mainEnvelope.attack(rampValue * MAX_ATTACK_TIME); break; case CC_EG_DECAY_LSB: // CC_60 // mainEnvelope.decay((float)longValue * 5.0); mainEnvelope.decay(rampValue * MAX_ATTACK_TIME); break; case CC_EG_SUSTAIN_LSB: // CC_61 mainEnvelope.sustain((float)longValue / RESO); break; case CC_EG_RELEASE_LSB: // CC_62 // mainEnvelope.release(1 + (float)longValue * 5.0); mainEnvelope.release(rampValue * MAX_ATTACK_TIME); break; case CC_LFO_RATE_LSB: // CC_63 dcLfoFreq.amplitude((float)longValue / RESO); break; case CC_PORTAMENTO_ON_OFF: // CC_65 /* Serial.print("portamento on off : "); Serial.println(value); */ if(value < 64){ glideEn = 1; } else { glideEn = 0; } break; case CC_BITCRUSH_OUT: // CC_91 bitCrushOutput.bits(value); break; case CC_OSC1_RANGE: // CC_102 osc1Waveform.frequency(NOTE_MIDI_0 / pow(2, value)); break; case CC_OSC1_WAVEFORM: // CC_103 osc1Waveform.begin(waveforms[value]); break; case CC_OSC2_RANGE: // CC_104 osc2Waveform.frequency(NOTE_MIDI_0 / pow(2, value)); break; case CC_OSC2_WAVEFORM: // CC_105 osc2Waveform.begin(waveforms[value]); break; case CC_OSC3_RANGE: // CC_106 osc3Waveform.frequency(NOTE_MIDI_0 / pow(2, value)); break; case CC_OSC3_WAVEFORM: // CC_107 osc3Waveform.begin(waveforms[value]); break; case CC_OSC3_CTRL: // CC_108 AudioNoInterrupts(); if(value > 63){ osc3ControlMixer.gain(0, 1); osc3ControlMixer.gain(1, 0); } else { osc3ControlMixer.gain(0, 0); osc3ControlMixer.gain(1, 1); } AudioInterrupts(); break; case CC_FILTER_MOD: // CC_109 if(value > 63){ filterMixer.gain(0, 2); } else { filterMixer.gain(0, 0); } break; case CC_FILTER_KEYTRACK_1: // CC_110 if(value > 63){ filterKeyTrack1 = 1; } else { filterKeyTrack1 = 0; } filterMixer.gain(3, ((float)filterKeyTrack1 * 0.333333 + (float)filterKeyTrack2 * 0.666667)); break; case CC_FILTER_KEYTRACK_2: // CC_111 if(value > 63){ filterKeyTrack2 = 1; } else { filterKeyTrack2 = 0; } filterMixer.gain(3, ((float)filterKeyTrack1 * 0.333333 + (float)filterKeyTrack2 * 0.666667)); break; case CC_TRANSPOSE: // CC_112 if(value > 63){ transpose++; if (transpose > 2) transpose = 2; } else { transpose--; if(transpose < -2) transpose = -2; } break; case CC_FUNCTION: // CC_113 if(value < 64){ noteOff(); keyTrackIndex = 0; usbMIDI.sendControlChange(CC_ALL_NOTE_OFF, 0, midiOutChannel); function = 1; // Serial.println("enterring function mode"); } else { function = 0; } break; case CC_NOISE_COLOR: // CC_114 AudioNoInterrupts(); if(value > 0){ noiseMixer.gain(0, 1); noiseMixer.gain(1, 0); } else { noiseMixer.gain(0, 0); noiseMixer.gain(1, 1); } AudioInterrupts(); break; case CC_OSC_MOD: // CC_115 if(value > 63){ oscMod = 1; mainTuneMixer.gain(3, 1); } else { oscMod = 0; mainTuneMixer.gain(3, 0); } break; /* case CC_DECAY_SW: // CC_116 AudioNoInterrupts(); if(value > 63){ decay = 1; filterEnvelope.release(filterDecay); mainEnvelope.release(egDecay); } else { decay = 0; filterEnvelope.release(0.0); mainEnvelope.release(0.0); } AudioInterrupts(); break; */ case CC_MOD_MIX_1: // CC_117 AudioNoInterrupts(); if(value > 63){ modMix1.gain(0, 0); modMix1.gain(1, 1); } else { modMix1.gain(0, 1); modMix1.gain(1, 0); } AudioInterrupts(); break; case CC_MOD_MIX_2: // CC_118 AudioNoInterrupts(); if(value > 63){ modMix2.gain(0, 0); modMix2.gain(1, 1); } else { modMix2.gain(0, 1); modMix2.gain(1, 0); } AudioInterrupts(); break; case CC_LFO_SHAPE: // CC_119 AudioNoInterrupts(); // LFO shape is centered around 0 (range from -1 to 1) when triangle (like a finger vibrato on a violin) // Square is offset, ranging from 0 to 1, like a duo-tone siren. if(value > 63){ lfoWaveform.begin(WAVEFORM_TRIANGLE); lfoWaveform.offset(0.0); lfoWaveform.amplitude(1.0); } else { lfoWaveform.begin(WAVEFORM_SQUARE); lfoWaveform.offset(0.5); lfoWaveform.amplitude(0.5); } AudioInterrupts(); break; case CC_ALL_NOTE_OFF: // CC_123 noteOff(); keyTrackIndex = 0; break; default: break; } } // Handle key press when in function mode. // Select the function to be set, then apply and save to memory the new setting. void handleKeyboardFunction(uint8_t key, bool active){ // /* Serial.print("key pressed : "); Serial.println(key); */ // Change function switch(key){ case 0: // lower DO currentFunction = FUNCTION_KEYBOARD_MODE; // Serial.println("keyboard mode"); break; case 2: // lower RE currentFunction = FUNCTION_RETRIGGER; // Serial.println("retrigger"); break; case 4: // lower MI currentFunction = FUNCTION_DETUNE; // Serial.println("detune"); break; case 5: // lower FA currentFunction = FUNCTION_BITCRUSH; // Serial.println("bitcrush"); break; case 7: // lower SOL currentFunction = FUNCTION_FILTER_MODE; break; case 9: // lower LA currentFunction = FUNCTION_MIDI_IN_CHANNEL; // Serial.println("midi in channel"); break; case 11: // lower SI currentFunction = FUNCTION_MIDI_OUT_CHANNEL; // Serial.println("midi out channel"); break; default: if(key < 12) return; key -= 12; break; } // note : the EEPROM.put() function could probably be called just once, but not all settings share the same type. switch(currentFunction){ case FUNCTION_KEYBOARD_MODE: if(key > KEY_UPPER) return; keyMode = (keyMode_t)key; EEPROM.put(EE_KEYBOARD_MODE_ADD, keyMode); break; case FUNCTION_RETRIGGER: if(key > 1) return; noteRetrigger = key; EEPROM.put(EE_TRIGGER_ADD, noteRetrigger); break; case FUNCTION_DETUNE: if(key > DETUNE_RESET) return; if(key == DETUNE_RESET){ // run a new detuning table resetDetuneTable(); } else { detune = (detune_t)key; EEPROM.put(EE_DETUNE_ADD, detune); } break; case FUNCTION_BITCRUSH: if(key > 12) return; key += 4; bitCrushOutput.bits(key); EEPROM.put(EE_BITCRUSH_ADD, key); break; case FUNCTION_FILTER_MODE: if(key > 1) return; filterMode = (filterMode_t)key; EEPROM.put(EE_FILTER_MODE, filterMode); AudioNoInterrupts(); // This is the same as in the CC handle function. // Could probably be a dedicate function called from both place. if(filterMode == FILTER_BAND_PASS){ if(filterBandValue < HALF_RESO){ bandMixer.gain(0, ((float)HALF_RESO - (float)filterBandValue) / HALF_RESO); bandMixer.gain(1, (float)filterBandValue / HALF_RESO); bandMixer.gain(2, 0.0); } else { bandMixer.gain(0, 0.0); bandMixer.gain(1, ((float)RESO - (float)filterBandValue) / HALF_RESO); bandMixer.gain(2, ((float)filterBandValue - HALF_RESO) / HALF_RESO); } } else if(filterMode == FILTER_BAND_STOP){ bandMixer.gain(0, (float)(RESO - filterBandValue) / RESO); bandMixer.gain(1, 0.0); bandMixer.gain(2, (float)filterBandValue / RESO); } AudioInterrupts(); break; case FUNCTION_MIDI_IN_CHANNEL: // change (usb) midi in channel // for memory : MIDI channels go from 1 to 16, hence the +1 offset. if(key > 15)return; midiInChannel = key + 1; //MIDI.begin(midiInChannel); EEPROM.put(EE_MIDI_IN_CH_ADD, midiInChannel); break; case FUNCTION_MIDI_OUT_CHANNEL: // change (usb) midi out channel if(key > 15)return; midiOutChannel = key + 1; //MIDI.begin(midiInChannel); EEPROM.put(EE_MIDI_OUT_CH_ADD, midiOutChannel); break; case FUNCTION_PITCH_BEND_RANGE: // Change pitch bend range if((key < 1) || (key > 16)) return; pitchBendRange = key; ampPitchBend.gain(pitchBendRange * HALFTONE_TO_DC * 2); EEPROM.put(EE_PITCH_BEND_RANGE, pitchBendRange); break; case FUNCTION_MOD_WHEEL_OSC_RANGE: // Change mod wheel range for osc if(key == 0){ currentFunction = FUNCTION_MOD_WHEEL_FILTER_RANGE; break; } modWheelOscRange = key; EEPROM.put(EE_MOD_WHEEL_OSC_RANGE, modWheelOscRange); break; case FUNCTION_MOD_WHEEL_FILTER_RANGE: // Change mod wheel range for osc if(key == 0) break; modWheelFilterRange = key; EEPROM.put(EE_MOD_WHEEL_FILTER_RANGE, modWheelFilterRange); break; default: break; } } void handlePitchBendFunction(){ currentFunction = FUNCTION_PITCH_BEND_RANGE; } // handle CC when in function mode // todo : use filter band mode control to set function in this mode, instead of keyboard. void handleCCFunction(uint8_t command, uint8_t value){ switch(command){ case CC_MOD_WHEEL: currentFunction = FUNCTION_MOD_WHEEL_OSC_RANGE; break; case CC_FUNCTION: // CC_113 if(value < 64){ function = 1; } else { function = 0; // Serial.println("exiting function mode"); } break; default: break; } } // Compute a new detune table. void resetDetuneTable(){ uint16_t address = EE_DETUNE_TABLE_ADD; randomSeed(millis()); for(uint8_t i = 0; i < 128; ++i){ float value = (random() - 0x3FFFFFFF) / (float)0x3FFFFFFF; value *= HALFTONE_TO_DC; EEPROM.put(address, value); address += 4; Serial.println(value, 5); } }