public void QuickSetup(int sampleRate, int note, float velocity, FilterDescriptor filterInfo)
{
CoeffNeedsUpdating = false;
CutOff = filterInfo.CutOff;
Resonance = filterInfo.Resonance;
FilterMethod = filterInfo.FilterMethod;
_a1 = 0;
_a2 = 0;
_b1 = 0;
_b2 = 0;
_m1 = 0;
_m2 = 0;
_m3 = 0;
if (CutOff <= 0 || Resonance <= 0)
{
FilterMethod = FilterType.None;
}
if (FilterMethod != FilterType.None)
{
CutOff *= SynthHelper.CentsToPitch((note - filterInfo.RootKey) * filterInfo.KeyTrack + (int)(velocity * filterInfo.VelTrack));
UpdateCoefficients(sampleRate);
}
}
private void LoadFilter(Sf2Region region)
{
fltr = new FilterDescriptor();
fltr.FilterMethod = FilterType.BiquadLowpass;
fltr.CutOff = (float)SynthHelper.KeyToFrequency(region.Generators[(int)GeneratorEnum.InitialFilterCutoffFrequency] / 100.0, 69);
fltr.Resonance = (float)SynthHelper.DBtoLinear(region.Generators[(int)GeneratorEnum.InitialFilterQ] / 10.0);
}
