SoundTransform soundTransform

Source 

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

Source 

@override
set soundTransform(SoundTransform value) {
  _soundTransform = value != null ? value : new SoundTransform();
  if (_audioElement == null) {
    // we can't set the audio element
  } else {
    var volume1 = _soundTransform.volume;
    var volume2 = SoundMixer._audioElementMixer.volume;
    _audioElement.volume = volume1 * volume2;
  }
}