C-TYPE: IXAudio2EngineCallback
C-TYPE: IXAudio2VoiceCallback
+C-TYPE: IXAudio2SourceVoice
+C-TYPE: IXAudio2SubmixVoice
+C-TYPE: IXAudio2MasteringVoice
COM-INTERFACE: IXAudio2 IUnknown {8bcf1f58-9fe7-4583-8ac6-e2adc465c8bb}
HRESULT GetDeviceCount ( UINT32* pCount )