public static void Start(this ModulationEnvelope envelope, RegionPair region, int key, int velocity)
{
// According to the implementation of TinySoundFont, the attack time should be adjusted by the velocity.
var delay = region.DelayModulationEnvelope;
var attack = region.AttackModulationEnvelope * ((145 - velocity) / 144F);
var hold = region.HoldModulationEnvelope * SoundFontMath.KeyNumberToMultiplyingFactor(region.KeyNumberToModulationEnvelopeHold, key);
var decay = region.DecayModulationEnvelope * SoundFontMath.KeyNumberToMultiplyingFactor(region.KeyNumberToModulationEnvelopeDecay, key);
var sustain = 1F - region.SustainModulationEnvelope / 100F;
var release = region.ReleaseModulationEnvelope;
envelope.Start(delay, attack, hold, decay, sustain, release);
}
public static void Start(this VolumeEnvelope envelope, RegionPair region, int key, int velocity)
{
// If the release time is shorter than 10 ms, it will be clamped to 10 ms to avoid pop noise.
var delay = region.DelayVolumeEnvelope;
var attack = region.AttackVolumeEnvelope;
var hold = region.HoldVolumeEnvelope * SoundFontMath.KeyNumberToMultiplyingFactor(region.KeyNumberToVolumeEnvelopeHold, key);
var decay = region.DecayVolumeEnvelope * SoundFontMath.KeyNumberToMultiplyingFactor(region.KeyNumberToVolumeEnvelopeDecay, key);
var sustain = SoundFontMath.DecibelsToLinear(-region.SustainVolumeEnvelope);
var release = Math.Max(region.ReleaseVolumeEnvelope, 0.01F);
envelope.Start(delay, attack, hold, decay, sustain, release);
}