void onAudio(AudioIOData& io){
while(io()){
if(tmr()){
// Our sequence of pitches
float pitches[] = {0,0,12,0,0,10,-5,0};
// Map pitch class to a frequency in Hz
float f = 55 * pow(2, pitches[step]/12.);
// Increment step counter
step = (step + 1) % 8;
// Set new target frequence of portamento
freq = f;
// Restart envelope using a soft reset (to avoid clicks)
env.resetSoft();
}
// Set saw frequency from portamento filter
saw.freq(freq());
// Get next envelope value
float e = env();
// Map envelope value to cutoff frequency
lpf.freq(e * (modCutoff.paraU()*6000 + 500) + 40);
// Generate next saw sample
float s = saw() * 0.3;
// Filter saw sample
s = lpf(s) * e;
// Send sample to DAC
io.out(0) = io.out(1) = s;
}
}
int main()
{
tmr.period(3); // Reset the envelope every 3 seconds
env.attack(0.01); // Attack time
env.decay(0.05); // Decay time
// Delays, lowpass, and allpass filters setup code goes here
//
lpf.type(LOW_PASS);
lpf.freq(2600);
lpf.res(sqrt(2.0)/2.0);
AudioIO audioIO(frameCount, samplingRate, audioCallBack, NULL, channelsOut, channelsIn);
Sync::master().spu(audioIO.framesPerSecond());
audioIO.start();
printf("Press 'enter' to quit...\n");
getchar();
return 0;
}
void audioCB(AudioIOData& io){
while(io()){
if(tmr()){
switch(cnt){
case 0: filt.type(Filter::LP); printf("Low-pass\n"); break;
case 1: filt.type(Filter::HP); printf("High-pass\n"); break;
case 2: filt.type(Filter::BP); printf("Band-pass\n"); break;
case 3: filt.type(Filter::BR); printf("Band-reject\n"); break;
}
++cnt %= 4;
}
float cutoff = scl::pow3(mod.triU()) * 10000;
filt.res(4);
filt.freq(cutoff);
float s = filt(src());
io.out(0) = io.out(1) = s * 0.1f;
}
}
