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);
}