// test of DaisySP synth object for the Teensy audio library // simple poly synth // some of this code was cribbed from the Faust for Teensy Additivesynth example // RH March 29 2021 #include #include //#define DEBUG // comment out to remove debug code #ifdef DEBUG Metro five_sec=Metro(5000); // Set up a 5 second Metro for performance stats #endif // constants for integer to float and float to integer conversion #define MULT_16 2147483647 #define DIV_16 4.6566129e-10 // for polyphony - an array of all current notes. // Value -1 means the note is off (not sounding). #define VOICES 16 // int StoredNotes[VOICES]; #include "daisysp.h" using namespace daisysp; // including the source files is a pain but that way you compile in only the modules you need // DaisySP statically allocates memory and some modules e.g. reverb use a lot of ram #include "synthesis/oscillator.cpp" #include "control/adsr.cpp" #include "filters/moogladder.cpp" #include "effects/reverbsc.cpp" // uses a LOT of ram float samplerate=AUDIO_SAMPLE_RATE_EXACT; // parameters we can modify via MIDI CCs int waveform=0; float detune=0; float filterfreq=100; float filtersweep=3000; float filterresonance=0.3; float reverblevel=0.1; float lfofreq=0.1; float lfofreqdepth=0; float lfofilterdepth=0; // create daisySP processing objects #define OSCSPERVOICE 3 // note - the detune code is set up for 3 oscillators Oscillator osc[VOICES * OSCSPERVOICE]; Oscillator lfo; Adsr env[VOICES]; MoogLadder filt[VOICES]; ReverbSc verb; // this is the function called by the AudioSynthDaisySP object when it needs a block of samples void AudioSynthDaisySP::update(void) { float out,sig,outsig,envelope,filtsig,wetvl, wetvr; bool gate; audio_block_t *block; block = allocate(); // grab an audio block if (!block) { return; } for (int i=0; i < AUDIO_BLOCK_SAMPLES; i++) { //**** insert daisySP generators here outsig=0; // sum up voices for (int i=0; idata[i] = val >> 16; } transmit(block); release(block); } // teensy audio objects and patch creation AudioOutputI2S out; //AudioOutputUSB outUSB; // USB audio breaks up badly AudioControlSGTL5000 audioShield; AudioSynthDaisySP synth; // create the daisysp synth audio object AudioConnection patchCord1(synth,0,out,0); AudioConnection patchCord2(synth,0,out,1); //AudioConnection patchCord3(synth,0,outUSB,0); //AudioConnection patchCord4(synth,0,outUSB,1); // frequencies for all 127 MIDI Note numbers. // C C# D D# E F F# G G# A A# B const float NoteNumToFreq[] = { 8.18, 8.66, 9.18, 9.72, 10.30, 10.91, 11.56, 12.25, 12.98, 13.75, 14.57, 15.43, 16.35, 17.32, 18.35, 19.45, 20.60, 21.83, 23.12, 24.50, 25.96, 27.50, 29.14, 30.87, 32.70, 34.65, 36.71, 38.89, 41.20, 43.65, 46.25, 49.00, 51.91, 55.00, 58.27, 61.74, 65.41, 69.30, 73.42, 77.78, 82.41, 87.31, 92.50, 98.00, 103.82, 110.00, 116.54, 123.47, 130.81, 138.59, 146.83, 155.56, 164.81, 174.61, 184.99, 195.99, 207.65, 220.00, 233.08, 246.94, 261.63, 277.18, 293.66, 311.13, 329.63, 349.23, 369.99, 391.99, 415.31, 440.00, 466.16, 493.88, 523.25, 554.37, 587.33, 622.25, 659.26, 698.46, 739.99, 783.99, 830.61, 880.00, 932.32, 987.77, 1046.50, 1108.73, 1174.66, 1244.51, 1318.51, 1396.91, 1479.98, 1567.98, 1661.22, 1760.00, 1864.66, 1975.53, 2093.00, 2217.46, 2349.32, 2489.02, 2637.02, 2793.83, 2959.96, 3135.96, 3322.44, 3520.00, 3729.31, 3951.07, 4186.01, 4434.92, 4698.64, 4978.03, 5274.04, 5587.65, 5919.91, 6271.93, 6644.88, 7040.00, 7458.62, 7902.13, 8372.02, 8869.84, 9397.27, 9956.06, 10548.08, 11175.30, 11839.82, 12543.85 }; void setup() { Serial.begin(38400); #ifdef DEBUG while (!Serial) { // wait for Arduino Serial Monitor to be ready } Serial.println("starting setup"); #endif for (int i=0; i< VOICES;++i) { StoredNotes[i]=-1; // initialize the note allocation array for (int j=0; j< OSCSPERVOICE; ++j) { osc[i*OSCSPERVOICE +j].Init(samplerate); // initialize the voice objects osc[i*OSCSPERVOICE +j].SetWaveform(Oscillator::WAVE_POLYBLEP_SAW); // changing waveforms on the fly seems to cause a crash } env[i].Init(samplerate); env[i].SetTime(ADENV_SEG_DECAY, 1.0f); filt[i].Init(samplerate); } lfo.Init(samplerate); // Init LFO oscillator lfo.SetFreq(0.1); // env.SetCurve(-15.0f); // only for AR env // initialize the reverb object and set its initial parameters verb.Init(samplerate); verb.SetFeedback(0.87); verb.SetLpFreq(10000.0f); // Enable the AudioShield AudioMemory(10); // only uses 2 blocks Serial.println("enabling audio shield"); audioShield.enable(); audioShield.volume(0.8); // Handles for the USB MIDI callbacks usbMIDI.setHandleNoteOn(myNoteOn); usbMIDI.setHandleNoteOff(myNoteOff); usbMIDI.setHandleControlChange(myControlChange); usbMIDI.setHandleAfterTouchPoly(myAfterTouch); #ifdef DEBUG Serial.println("finished setup"); #endif } // Only looking for incoming MIDI events in the loop() // myNoteOn(), myNoteOff() and myControlChange() will be processed on incoming MIDI messages. void loop() { usbMIDI.read(); #ifdef DEBUG // DEBUG - Microcontroller Load Check if (five_sec.check() == 1) { Serial.print("Proc = "); Serial.print(AudioProcessorUsage()); Serial.print(" ("); Serial.print(AudioProcessorUsageMax()); Serial.print("), Mem = "); Serial.print(AudioMemoryUsage()); Serial.print(" ("); Serial.print(AudioMemoryUsageMax()); Serial.println(")"); } #endif } // Callback for incoming NoteOn messages // Handling the voice allocation here. void myNoteOn(byte channel, byte note, byte velocity) { int i=0; while( i < VOICES){ if (StoredNotes[i] == -1) { // if voice is idle StoredNotes[i] = int(note); // allocate this voice osc[i*OSCSPERVOICE].SetFreq(NoteNumToFreq[note]); osc[i*OSCSPERVOICE+1].SetFreq(NoteNumToFreq[note]+detune); // quick and dirty detune osc[i*OSCSPERVOICE+2].SetFreq(NoteNumToFreq[note]-detune); // env[i].Trigger(); // ADSR triggering happens in the sample loop break; } ++i; } } // Callback for incoming NoteOff messages // Releasing voices to be re-allocated here. void myNoteOff(byte channel, byte note, byte velocity) { for (int i=0; i < VOICES; ++i){ int k = int(note); if (StoredNotes[i] == k) { // if this voice matches the note we are silencing StoredNotes[i] = -1; // deallocate the voice } } } // Callback for incoming CC messages // I'm using an external MIDI controller (Arturia Beatstep) to set voice parameters // you can also do this with pots and AnalogRead() void myControlChange(byte channel, byte control, byte value) { float val = float(value) / 127; // convert to 0-1 for (int i=0; i < VOICES; ++i){ switch (control) { case 101: waveform=value/40; // chaning waveforms on the fly doesn't seem to work break; case 102: detune=val*5; // oscillator detune break; case 103: break; case 105: env[i].SetTime(ADSR_SEG_ATTACK,val); break; case 106: env[i].SetTime(ADSR_SEG_DECAY,val); break; case 107: env[i].SetSustainLevel(val); break; case 108: env[i].SetTime(ADSR_SEG_RELEASE,val); break; case 113: filterfreq=50+val*2000; // filter cutoff break; case 114: filtersweep=val*10000; // filter sweep - controlled by envelope break; case 115: filt[i].SetRes(val); // filter resonance break; case 116: reverblevel=val; // reverb break; default: break; } } } // Callback for incoming Aftertouch messages void myAfterTouch(byte channel, byte note, byte value) { float val = float(value) / 127; // convert to 0-1 }