// todo Abundant Music WebAudioPlayer has synthesis settings. How did it do the percussion?
private DiscreteSignal GetPercussionSignal(PercussionType percussionType, int sampleCount)
{
switch (percussionType)
{
// Bass drums
case PercussionType.Bass:
var bass = SignalHelper.GetChirp(90, 120, sampleCount);
var bass2 = SignalHelper.GetChirp(180, 240, sampleCount);
var bass3 = SignalHelper.GetChirp(270, 360, sampleCount);
// The chirp builder goes in the "up" direction, so we need to reverse it to go "down"
bass = new DiscreteSignal(Constants.SAMPLE_RATE, bass.Samples.Reverse());
bass2 = new DiscreteSignal(Constants.SAMPLE_RATE, bass2.Samples.Reverse());
bass3 = new DiscreteSignal(Constants.SAMPLE_RATE, bass3.Samples.Reverse());
// Combine the two bass signals so that the bass has more "presence"
bass = bass.Superimpose(bass2).Superimpose(bass3);
return(bass);
// Snare drums
case PercussionType.Snare:
var snare = SignalHelper.GetKarplusStrongDrum(0.5, 30, 1, 1, sampleCount);
return(snare);
// Crash drums
case PercussionType.Crash:
var crash = SignalHelper.GetKarplusStrongDrum(0.5, 11, 1, 1, sampleCount);
return(crash);
// Ride drums
case PercussionType.Ride:
// Defaulting to a ride drum probably isn't good, but it will sound in lots of situations.
default:
var ride = SignalHelper.GetKarplusStrongDrum(0.5, 60, 0.1, 1, sampleCount);
return(ride);
}
}