© 2010 Dr. M Grierson / Strangeloop

10. Filters

#include "maximilian.h"

osc myCounter,mySwitchableOsc;
int CurrentCount;
double myOscOutput,myFilteredOutput;
double myEnvelopeData[6] = {500,0,1000,500,0,500};
//this data will be used to make an envelope. Value and time to value in ms.
envelope myEnvelope;
filter myFilter;

extern int channels=2;//stereo-must be supported by hardware
extern int buffersize=256;//should be fine for most things
extern int samplerate=44100;//SR must be supported by card. It's always the default

void setup() {//some inits
myEnvelope.amplitude=myEnvelopeData[0]; //initialise the envelope
}

void play(double *output) {

CurrentCount=myCounter.phasor(1, 1, 9);
//phasor can take three arguments; frequency, start value and end value.

if (CurrentCount<5)//simple if statement

myOscOutput=mySwitchableOsc.square(CurrentCount*100);

else if (CurrentCount>=5)//and the 'else' bit.

myOscOutput=mySwitchableOsc.saw(CurrentCount*50);
//one osc object can produce whichever waveform you want.

if (CurrentCount==1)

myEnvelope.trigger(0,myEnvelopeData[0]); //trigger the envelope

myFilteredOutput=myFilter.lores(myOscOutput,(myEnvelope.line(6, myEnvelopeData)),10);
//lores takes an audio input, a frequency and a resonance factor (1-100)

*output=myFilteredOutput;//point me at your speakers and fire.
}

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