internal static extern AudioManagerError Deactivate(AudioDuckingHandle ducking);
internal static extern AudioManagerError IsDucked(AudioDuckingHandle ducking, out bool isDucked);
internal static extern AudioManagerError Activate(AudioDuckingHandle ducking, uint duration, double ratio);
internal static extern AudioManagerError Create(AudioStreamType targetType, DuckingStateChangedCallback callback, IntPtr userData, out AudioDuckingHandle ducking);