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libraries/audio-tools/examples/examples-dsp/examples-maximilian/14-MonoSynth/14-MonoSynth.ino

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+//This shows how to use maximilian to build a monophonic synth
+
+#include "AudioTools.h"
+#include "AudioTools/AudioLibs/MaximilianDSP.h"
+
+// Define Arduino output
+I2SStream out;
+Maximilian maximilian(out);
+
+//These are the synthesiser bits
+maxiOsc VCO1,VCO2,LFO1,LFO2;
+maxiFilter VCF;
+maxiEnv V_ADSR;
+
+//This is a bunch of control signals so that we can hear something
+maxiOsc timer;//this is the metronome
+int currentCount,lastCount;//these values are used to check if we have a new beat this sample
+
+//and these are some variables we can use to pass stuff around
+
+double VCO1out,VCO2out,LFO1out,LFO2out,VCFout,ADSRout;
+
+
+void setup() {//some inits
+    // setup logging
+    Serial.begin(115200);
+    AudioToolsLogger.begin(Serial, AudioToolsLogLevel::Info);
+
+    // setup audio output
+    auto cfg = out.defaultConfig(TX_MODE);
+    out.begin(cfg);
+    maximilian.begin(cfg);
+
+    // setup maximilian   
+    
+    V_ADSR.setAttack(1000);
+    V_ADSR.setDecay(1);
+    V_ADSR.setSustain(1);
+    V_ADSR.setRelease(1000);
+}
+
+void play(float *output) {
+    
+    //so this first bit is just a basic metronome so we can hear what we're doing.
+    
+    currentCount=(int)timer.phasor(0.5);//this sets up a metronome that ticks every 2 seconds
+    
+    
+    if (lastCount!=currentCount) {//if we have a new timer int this sample, play the sound
+        V_ADSR.trigger=1;
+        
+        cout << "tick\n";//the clock ticks
+        
+        lastCount=0;//set lastCount to 0
+    }
+    
+    //and this is where we build the synth
+    
+    ADSRout=V_ADSR.adsr(1.0,V_ADSR.trigger);
+    
+    LFO1out=LFO1.sinebuf(0.2);//this lfo is a sinewave at 0.2 hz
+    
+    VCO1out=VCO1.pulse(55,0.6);//here's VCO1. it's a pulse wave at 55 hz, with a pulse width of 0.6
+    VCO2out=VCO2.pulse(110+LFO1out,0.2);//here's VCO2. it's a pulse wave at 110hz with LFO modulation on the frequency, and width of 0.2
+    
+    
+    VCFout=VCF.lores((VCO1out+VCO2out)*0.5, ADSRout*10000, 10);//now we stick the VCO's into the VCF, using the V_ADSR as the filter cutoff
+    
+    double finalSound=VCFout*ADSRout;//finally we add the V_ADSR as an amplitude modulator
+    V_ADSR.trigger=0;
+    output[0]=finalSound;
+    output[1]=finalSound;
+}
+
+// Arduino loop
+void loop() {
+    maximilian.copy();
+}