public AudioStreamModifier(ISampleProvider sample, double rateMult, int pitchDelta)
{
_sample = sample;
WaveFormat = _sample.WaveFormat;
_soundTouch = new SoundTouch<float, double>();
channelCount = sample.WaveFormat.Channels;
_soundTouch.SetSampleRate(sample.WaveFormat.SampleRate);
_soundTouch.SetChannels(channelCount);
rateMult = (rateMult - 1) * 100;
_soundTouch.SetTempoChange(rateMult);
_soundTouch.SetPitchSemiTones(pitchDelta*0.25f);
_soundTouch.SetRateChange(1.0f);
_soundTouch.SetSetting(SettingId.UseQuickseek, 1);
_soundTouch.SetSetting(SettingId.UseAntiAliasFilter, 1);
_soundTouch.SetSetting(SettingId.SequenceDurationMs, 40);
_soundTouch.SetSetting(SettingId.SeekwindowDurationMs, 15);
_soundTouch.SetSetting(SettingId.OverlapDurationMs, 8);
sourceReadBuffer = new float[(WaveFormat.SampleRate * channelCount * readDurationMilliseconds) / 1000];
soundTouchReadBuffer = new float[sourceReadBuffer.Length * 10]; // support down to 0.1 speed
}