SoundTransform soundTransform

Source 

static SoundTransform get soundTransform {
  return _soundTransform;
}
void soundTransform=(SoundTransform value)

Source 

static set soundTransform(SoundTransform value) {
  _initEngine();
  _soundTransform = value ?? new SoundTransform();
  _webAudioApiMixer?.applySoundTransform(_soundTransform);
  _audioElementMixer?.applySoundTransform(_soundTransform);
}