IXAudio2VoiceCallback: Client notification interface for voice events.
REMARKS: Contains methods to notify the client when certain events happen
in an XAudio2 voice. This interface should be implemented by the
client. XAudio2 will call these methods via an interface pointer
provided by the client in the IXAudio2::CreateSourceVoice call.
IXAudio2VoiceCallback: Client notification interface for voice events.
REMARKS: Contains methods to notify the client when certain events happen in an XAudio2 voice. This interface should be implemented by the client. XAudio2 will call these methods via an interface pointer provided by the client in the IXAudio2::CreateSourceVoice call.