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diff --git a/utils/scenemanager/snd_wave_mixer_private.h b/utils/scenemanager/snd_wave_mixer_private.h
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+++ b/utils/scenemanager/snd_wave_mixer_private.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $Date:         $
+//
+//-----------------------------------------------------------------------------
+// $Log: $
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef SND_WAVE_MIXER_PRIVATE_H
+#define SND_WAVE_MIXER_PRIVATE_H
+#pragma once
+
+#include "snd_audio_source.h"
+#include "snd_wave_mixer.h"
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Linear iterator over source data.
+//			Keeps track of position in source, and maintains necessary buffers
+//-----------------------------------------------------------------------------
+class CWaveData
+{
+public:
+	virtual ~CWaveData( void ) {}
+	virtual CAudioSourceWave &Source( void ) = 0;
+	virtual int ReadSourceData( void **pData, int sampleIndex, int sampleCount, bool forward = true ) = 0;
+};
+
+class CAudioMixerWave : public CAudioMixer
+{
+public:
+	CAudioMixerWave( CWaveData *data );
+	virtual ~CAudioMixerWave( void );
+
+	virtual bool MixDataToDevice( IAudioDevice *pDevice, channel_t *pChannel, int startSample, int sampleCount, int outputRate, bool forward = true );
+	virtual void IncrementSamples( channel_t *pChannel, int startSample, int sampleCount,int outputRate, bool forward = true );
+	virtual bool SkipSamples( channel_t *pChannel, int startSample, int sampleCount,int outputRate, bool forward = true  );
+	virtual void Mix( IAudioDevice *pDevice, 
+					channel_t *pChannel, 
+					void *pData, 
+					int outputOffset, 
+					int inputOffset, 
+					fixedint fracRate, 
+					int outCount, 
+					int timecompress,
+					bool forward = true ) = 0;
+
+	virtual int	 GetOutputData( void **pData, int samplePosition, int sampleCount, bool forward = true );
+
+	virtual CAudioSource *GetSource( void );
+
+	virtual int GetSamplePosition( void );
+
+	virtual bool SetSamplePosition( int position );
+	virtual void SetLoopPosition( int position );
+	virtual int	GetStartPosition( void );
+
+	virtual bool	GetActive( void );
+	virtual void	SetActive( bool active );
+
+	virtual void	SetModelIndex( int index );
+	virtual int		GetModelIndex( void ) const;
+
+	virtual void	SetDirection( bool forward );
+	virtual bool	GetDirection( void ) const;
+
+	virtual void	SetAutoDelete( bool autodelete );
+	virtual bool	GetAutoDelete( void ) const;
+protected:
+	int					m_sample;
+	int					m_absoluteSample;
+	int					m_startpos;
+	int					m_loop;
+	int					m_fracOffset;
+	CWaveData			*m_pData;
+
+	int					m_absoluteStartPos;
+
+	bool				m_bActive;
+	// Associated playback model in faceposer
+	int					m_nModelIndex;
+
+	bool				m_bForward;
+
+	bool				m_bAutoDelete;
+};
+
+
+#endif // SND_WAVE_MIXER_PRIVATE_H