99 lines
2.9 KiB
C++
99 lines
2.9 KiB
C++
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//This shows how to use maximilian to build a polyphonic synth.
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#include "AudioTools.h"
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#include "AudioTools/AudioLibs/MaximilianDSP.h"
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// Define Arduino output
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I2SStream out;
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Maximilian maximilian(out);
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//These are the synthesiser bits
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maxiOsc VCO1[6],VCO2[6],LFO1[6],LFO2[6];
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maxiFilter VCF[6];
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maxiEnv V_ADSR[6];
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//This is a bunch of control signals so that we can hear something
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maxiOsc timer;//this is the metronome
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int currentCount,lastCount,voice=0;//these values are used to check if we have a new beat this sample
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//and these are some variables we can use to pass stuff around
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double VCO1out[6],VCO2out[6],LFO1out[6],LFO2out[6],VCFout[6],ADSRout[6],mix,pitch[6];
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void setup() {//some inits
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// setup logging
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Serial.begin(115200);
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AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
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// setup audio output
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auto cfg = out.defaultConfig(TX_MODE);
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out.begin(cfg);
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maximilian.begin(cfg);
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// setup maximilian
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for (int i=0;i<6;i++) {
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V_ADSR[i].setAttack(0);
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V_ADSR[i].setDecay(200);
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V_ADSR[i].setSustain(0.2);
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V_ADSR[i].setRelease(2000);
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}
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}
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void play(float *output) {
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mix=0;//we're adding up the samples each update and it makes sense to clear them each time first.
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//so this first bit is just a basic metronome so we can hear what we're doing.
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currentCount=(int)timer.phasor(8);//this sets up a metronome that ticks 8 times a second
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if (lastCount!=currentCount) {//if we have a new timer int this sample, play the sound
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if (voice==6) {
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voice=0;
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}
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V_ADSR[voice].trigger=1;//trigger the envelope from the start
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pitch[voice]=voice+1;
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voice++;
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}
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//and this is where we build the synth
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for (int i=0; i<6; i++) {
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ADSRout[i]=V_ADSR[i].adsr(1.,V_ADSR[i].trigger);//our V_ADSR env is passed a constant signal of 1 to generate the transient.
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LFO1out[i]=LFO1[i].sinebuf(0.2);//this lfo is a sinewave at 0.2 hz
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VCO1out[i]=VCO1[i].pulse(55*pitch[i],0.6);//here's VCO1. it's a pulse wave at 55 hz, with a pulse width of 0.6
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VCO2out[i]=VCO2[i].pulse((110*pitch[i])+LFO1out[i],0.2);//here's VCO2. it's a pulse wave at 110hz with LFO modulation on the frequency, and width of 0.2
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VCFout[i]=VCF[i].lores((VCO1out[i]+VCO2out[i])*0.5, 250+((pitch[i]+LFO1out[i])*1000), 10);//now we stick the VCO's into the VCF, using the V_ADSR as the filter cutoff
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mix+=VCFout[i]*ADSRout[i]/6;//finally we add the V_ADSR as an amplitude modulator
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}
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output[0]=mix*0.5;//left channel
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output[1]=mix*0.5;//right channel
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// This just sends note-off messages.
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for (int i=0; i<6; i++) {
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V_ADSR[i].trigger=0;
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}
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}
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// Arduino loop
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void loop() {
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maximilian.copy();
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}
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