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diff --git a/engine/audio/private/voice_sound_engine_interface.h b/engine/audio/private/voice_sound_engine_interface.h
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+++ b/engine/audio/private/voice_sound_engine_interface.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//          
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef VOICE_SOUND_ENGINE_INTERFACE_H
+#define VOICE_SOUND_ENGINE_INTERFACE_H
+#pragma once
+
+
+/*! @defgroup VoiceSoundEngineInterface VoiceSoundEngineInterface
+Abstracts out the sound engine for the voice code.
+GoldSrc and Src each have a different implementation of this.
+@{
+*/
+
+
+
+//! Max number of receiving voice channels.
+#define VOICE_NUM_CHANNELS			5	
+
+// ----------------------------------------------------------------------------- //
+// Functions for voice.cpp.
+// ----------------------------------------------------------------------------- //
+
+//! Initialize the sound engine interface.
+bool VoiceSE_Init();	
+
+//! Shutdown the sound engine interface.
+void VoiceSE_Term();	
+
+//! Called each frame.
+void VoiceSE_Idle(float frametime);
+
+
+//! Start audio playback on the specified voice channel.
+//! Voice_GetChannelAudio is called by the mixer for each active channel.
+int VoiceSE_StartChannel(
+	//! Which channel to start.
+	int iChannel,
+	int iEntity,
+	bool bProximity,
+	int nViewEntityIndex
+	);
+
+//! Stop audio playback on the specified voice channel.
+void VoiceSE_EndChannel(
+	//! Which channel to stop.
+	int iChannel,
+	int iEntity
+	);
+
+//! Starts the voice overdrive (lowers volume of all sounds other than voice).
+void VoiceSE_StartOverdrive();
+void VoiceSE_EndOverdrive();
+
+//! Control mouth movement for an entity.
+void VoiceSE_InitMouth(int entnum);
+void VoiceSE_CloseMouth(int entnum);
+void VoiceSE_MoveMouth(int entnum, short *pSamples, int nSamples);
+
+
+// ----------------------------------------------------------------------------- //
+// Functions for voice.cpp to implement.
+// ----------------------------------------------------------------------------- //
+
+//! This function is implemented in voice.cpp. Gives 16-bit signed mono samples to the mixer.
+//! \return Number of samples actually gotten.
+int Voice_GetOutputData(
+	//! The voice channel it wants samples from.
+	const int iChannel,			
+	//! The buffer to copy the samples into.
+	char *copyBuf,				
+	//! Maximum size of copyBuf.
+	const int copyBufSize,		
+	//! Which sample to start at.
+	const int samplePosition,	
+	//! How many samples to get.
+	const int sampleCount		
+	);
+
+// This is called when an audio source is deleted by the sound engine. The voice could
+// should detach whatever it needs to in order to free up the specified channel.
+void Voice_OnAudioSourceShutdown( int iChannel );
+
+
+// ----------------------------------------------------------------------------- //
+// Functions for the sound engine.
+// ----------------------------------------------------------------------------- //
+
+class CAudioSource;
+CAudioSource* Voice_SetupAudioSource( int soundsource, int entchannel );
+
+
+
+/*! @} End VoiceSoundEngineInterface group */
+
+
+#endif // VOICE_SOUND_ENGINE_INTERFACE_H