// No audio is rendered in this method.
// This code is only here to get updates synchronized in audio frame time.
private void OnAudioFilterRead(float[] data, int channels)
{
bool playNote = (audioFrameCount % speed) == 0;
if (playNote)
{
int note = sequence[sequenceIdx++];
sequenceIdx %= sequence.Length;
if (note != -1)
{
note += pitch;
synth.HandleEventNow(new EventQueue.QueuedEvent(EventQueue.EventType.Note_off, 0, -1));
synth.HandleEventNow(new EventQueue.QueuedEvent(EventQueue.EventType.Note_on, note, -1));
}
}
if (lfo1enabled)
{
lfo1.set_freq(lfo1Freq * 1024);
lfo1.update();
synth.set_parameter(lfo1Param, lfo1BaseValue + lfo1.sin() * lfo1Strength);
}
if (lfo2enabled)
{
lfo2.set_freq(lfo2Freq * 1024);
lfo2.update();
synth.set_parameter(lfo2Param, lfo2BaseValue + lfo2.sin() * lfo2Strength);
}
audioFrameCount++;
}
private void update_params()
{
// Set synth params
float freq = freqtab[current_note & 0x7f];
osc1.set_freq(freq, sample_rate);
osc2.set_freq(freq * 0.5f, sample_rate);
fenv.set_freq(1.0f / filterEnvDecay, sample_rate);
lfo.set_freq(pwmFrequency * 2.3f, sample_rate);
float env01 = fenv.quad_down01();
if (filterType == FilterType.Schmid)
{
filter1.SetResonance(resonance);
filter2.SetResonance(resonance);
filter1.SetCutoff(cutoffFrequency * env01); // 0 Hz cutoff is bad
filter2.SetCutoff(cutoffFrequency * env01);
filter1.SetOversampling(oversampling);
filter2.SetOversampling(oversampling);
}
#if LAZZARINI_FILTER
else if (filterType == FilterType.Lazzarini)
{
filter1Laz.SetResonance(resonance);
filter2Laz.SetResonance(resonance);
filter1Laz.SetCutoff(cutoffFrequency * env01);
filter2Laz.SetCutoff(cutoffFrequency * env01);
}
#endif
aenv.setAttackRate(aenv_attack * sample_rate);
aenv.setDecayRate(aenv_decay * sample_rate);
aenv.setReleaseRate(aenv_release * sample_rate);
aenv.setSustainLevel(aenv_sustain);
}