diff --git a/core/MenuStyle_Base.cpp b/core/MenuStyle_Base.cpp
index 0d2bfee1..665a221c 100644
--- a/core/MenuStyle_Base.cpp
+++ b/core/MenuStyle_Base.cpp
@@ -337,6 +337,9 @@ void BaseMenuStyle::ClientPressedKey(int client, unsigned int key_press)
 #endif
 							0, 
 							PITCH_NORM, 
+#if SOURCE_ENGINE == SE_ORANGEBOXVALVE
+							0,
+#endif
 							&pos);
 					}
 				}
diff --git a/extensions/sdktools/vnatives.cpp b/extensions/sdktools/vnatives.cpp
index effab0fc..a4836221 100644
--- a/extensions/sdktools/vnatives.cpp
+++ b/extensions/sdktools/vnatives.cpp
@@ -528,7 +528,9 @@ static cell_t SlapPlayer(IPluginContext *pContext, const cell_t *params)
 			CellRecipientFilter rf;
 			rf.SetToReliable(true);
 			rf.Initialize(player_list, total_players);
-#if SOURCE_ENGINE < SE_PORTAL2
+#if SOURCE_ENGINE == SE_ORANGEBOXVALVE
+			engsound->EmitSound(rf, params[1], CHAN_AUTO, sound_name, VOL_NORM, ATTN_NORM, 0, PITCH_NORM, 0, &pos);
+#elif SOURCE_ENGINE < SE_PORTAL2
 			engsound->EmitSound(rf, params[1], CHAN_AUTO, sound_name, VOL_NORM, ATTN_NORM, 0, PITCH_NORM, &pos);
 #else
 			engsound->EmitSound(rf, params[1], CHAN_AUTO, sound_name, -1, sound_name, VOL_NORM, ATTN_NORM, 0, 0, PITCH_NORM, &pos);
diff --git a/extensions/sdktools/vsound.cpp b/extensions/sdktools/vsound.cpp
index dc024e88..622b025e 100644
--- a/extensions/sdktools/vsound.cpp
+++ b/extensions/sdktools/vsound.cpp
@@ -36,6 +36,9 @@ SH_DECL_HOOK8_void(IVEngineServer, EmitAmbientSound, SH_NOATTRIB, 0, int, const
 #if SOURCE_ENGINE >= SE_PORTAL2
 SH_DECL_HOOK17(IEngineSound, EmitSound, SH_NOATTRIB, 0, int, IRecipientFilter &, int, int, const char *, unsigned int, const char *, float, float, int, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int);
 SH_DECL_HOOK17(IEngineSound, EmitSound, SH_NOATTRIB, 1, int, IRecipientFilter &, int, int, const char *, unsigned int, const char *, float, soundlevel_t, int, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int);
+#elif SOURCE_ENGINE == SE_ORANGEBOXVALVE
+SH_DECL_HOOK15_void(IEngineSound, EmitSound, SH_NOATTRIB, 0, IRecipientFilter &, int, int, const char *, float, float, int, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int);
+SH_DECL_HOOK15_void(IEngineSound, EmitSound, SH_NOATTRIB, 1, IRecipientFilter &, int, int, const char *, float, soundlevel_t, int, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int);
 #else
 SH_DECL_HOOK14_void(IEngineSound, EmitSound, SH_NOATTRIB, 0, IRecipientFilter &, int, int, const char *, float, float, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int);
 SH_DECL_HOOK14_void(IEngineSound, EmitSound, SH_NOATTRIB, 1, IRecipientFilter &, int, int, const char *, float, soundlevel_t, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int);
@@ -262,6 +265,11 @@ int SoundHooks::OnEmitSound(IRecipientFilter &filter, int iEntIndex, int iChanne
 							 float flVolume, soundlevel_t iSoundlevel, int nSeed, int iFlags, int iPitch, const Vector *pOrigin, 
 							 const Vector *pDirection, CUtlVector<Vector> *pUtlVecOrigins, bool bUpdatePositions, 
 							 float soundtime, int speakerentity)
+#elif SOURCE_ENGINE == SE_ORANGEBOXVALVE
+void SoundHooks::OnEmitSound(IRecipientFilter &filter, int iEntIndex, int iChannel, const char *pSample, 
+							 float flVolume, soundlevel_t iSoundlevel, int iFlags, int iPitch, int iSpecialDSP, const Vector *pOrigin, 
+							 const Vector *pDirection, CUtlVector<Vector> *pUtlVecOrigins, bool bUpdatePositions, 
+							 float soundtime, int speakerentity)
 #else
 void SoundHooks::OnEmitSound(IRecipientFilter &filter, int iEntIndex, int iChannel, const char *pSample, 
 							 float flVolume, soundlevel_t iSoundlevel, int iFlags, int iPitch, const Vector *pOrigin, 
@@ -318,6 +326,14 @@ void SoundHooks::OnEmitSound(IRecipientFilter &filter, int iEntIndex, int iChann
 					(crf, iEntIndex, iChannel, buffer, -1, buffer, flVolume, iSoundlevel, nSeed, iFlags, iPitch, pOrigin, 
 					pDirection, pUtlVecOrigins, bUpdatePositions, soundtime, speakerentity)
 					);
+#elif SOURCE_ENGINE == SE_ORANGEBOXVALVE
+				RETURN_META_NEWPARAMS(
+					MRES_IGNORED,
+					static_cast<void (IEngineSound::*)(IRecipientFilter &, int, int, const char*, float, soundlevel_t, 
+					int, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int)>(&IEngineSound::EmitSound), 
+					(crf, iEntIndex, iChannel, buffer, flVolume, iSoundlevel, iFlags, iPitch, iSpecialDSP, pOrigin, 
+					pDirection, pUtlVecOrigins, bUpdatePositions, soundtime, speakerentity)
+					);
 #else
 				RETURN_META_NEWPARAMS(
 					MRES_IGNORED,
@@ -341,6 +357,11 @@ int SoundHooks::OnEmitSound2(IRecipientFilter &filter, int iEntIndex, int iChann
 							 float flVolume, float flAttenuation, int nSeed, int iFlags, int iPitch, const Vector *pOrigin, 
 							 const Vector *pDirection, CUtlVector<Vector> *pUtlVecOrigins, bool bUpdatePositions, 
 							 float soundtime, int speakerentity)
+#elif SOURCE_ENGINE == SE_ORANGEBOXVALVE
+void SoundHooks::OnEmitSound2(IRecipientFilter &filter, int iEntIndex, int iChannel, const char *pSample, 
+							 float flVolume, float flAttenuation, int iFlags, int iPitch, int iSpecialDSP, const Vector *pOrigin, 
+							 const Vector *pDirection, CUtlVector<Vector> *pUtlVecOrigins, bool bUpdatePositions, 
+							 float soundtime, int speakerentity)
 #else
 void SoundHooks::OnEmitSound2(IRecipientFilter &filter, int iEntIndex, int iChannel, const char *pSample, 
 							 float flVolume, float flAttenuation, int iFlags, int iPitch, const Vector *pOrigin, 
@@ -398,6 +419,14 @@ void SoundHooks::OnEmitSound2(IRecipientFilter &filter, int iEntIndex, int iChan
 					(crf, iEntIndex, iChannel, buffer, -1, buffer, flVolume, SNDLVL_TO_ATTN(static_cast<soundlevel_t>(sndlevel)), 
 					nSeed, iFlags, iPitch, pOrigin, pDirection, pUtlVecOrigins, bUpdatePositions, soundtime, speakerentity)
 					);
+#elif SOURCE_ENGINE == SE_ORANGEBOXVALVE
+RETURN_META_NEWPARAMS(
+					MRES_IGNORED,
+					static_cast<void (IEngineSound::*)(IRecipientFilter &, int, int, const char *, float, float, 
+					int, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int)>(&IEngineSound::EmitSound), 
+					(crf, iEntIndex, iChannel, buffer, flVolume, SNDLVL_TO_ATTN(static_cast<soundlevel_t>(sndlevel)), 
+					iFlags, iPitch, iSpecialDSP, pOrigin, pDirection, pUtlVecOrigins, bUpdatePositions, soundtime, speakerentity)
+					);
 #else
 				RETURN_META_NEWPARAMS(
 					MRES_IGNORED,
@@ -654,6 +683,47 @@ static cell_t EmitSound(IPluginContext *pContext, const cell_t *params)
 					soundtime,
 					speakerentity);
 			}
+#elif SOURCE_ENGINE == SE_ORANGEBOXVALVE
+			if (g_InSoundHook)
+			{
+				SH_CALL(enginesoundPatch, 
+					static_cast<void (IEngineSound::*)(IRecipientFilter &, int, int, const char*, float, 
+					soundlevel_t, int, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int)>
+					(&IEngineSound::EmitSound))
+					(crf, 
+					player[0], 
+					channel, 
+					sample, 
+					vol, 
+					(soundlevel_t)level, 
+					flags, 
+					pitch, 
+					0, 
+					pOrigin,
+					pDir,
+					pOrigVec,
+					updatePos,
+					soundtime,
+					speakerentity);
+			}
+			else
+			{
+				engsound->EmitSound(crf, 
+					player[0], 
+					channel, 
+					sample, 
+					vol, 
+					(soundlevel_t)level, 
+					flags, 
+					pitch, 
+					0, 
+					pOrigin,
+					pDir,
+					pOrigVec,
+					updatePos,
+					soundtime,
+					speakerentity);
+			}
 #else
 			if (g_InSoundHook)
 			{
@@ -741,6 +811,47 @@ static cell_t EmitSound(IPluginContext *pContext, const cell_t *params)
 				soundtime,
 				speakerentity);
 		}
+#elif SOURCE_ENGINE == SE_ORANGEBOXVALVE
+		if (g_InSoundHook)
+		{
+			SH_CALL(enginesoundPatch, 
+				static_cast<void (IEngineSound::*)(IRecipientFilter &, int, int, const char*, float, 
+				soundlevel_t, int, int, int, const Vector *, const Vector *, CUtlVector<Vector> *, bool, float, int)>
+				(&IEngineSound::EmitSound))
+				(crf, 
+				entity, 
+				channel, 
+				sample, 
+				vol, 
+				(soundlevel_t)level, 
+				flags, 
+				pitch, 
+				0, 
+				pOrigin,
+				pDir,
+				pOrigVec,
+				updatePos,
+				soundtime,
+				speakerentity);
+		}
+		else
+		{
+			engsound->EmitSound(crf, 
+				entity, 
+				channel, 
+				sample, 
+				vol, 
+				(soundlevel_t)level, 
+				flags, 
+				pitch, 
+				0, 
+				pOrigin,
+				pDir,
+				pOrigVec,
+				updatePos,
+				soundtime,
+				speakerentity);
+		}
 #else
 		if (g_InSoundHook)
 		{
diff --git a/extensions/sdktools/vsound.h b/extensions/sdktools/vsound.h
index cf96877f..ac32f7dd 100644
--- a/extensions/sdktools/vsound.h
+++ b/extensions/sdktools/vsound.h
@@ -63,6 +63,17 @@ public:
 #else
 	void OnEmitAmbientSound(int entindex, const Vector &pos, const char *samp, float vol, 
 		soundlevel_t soundlevel, int fFlags, int pitch, float delay);
+#if SOURCE_ENGINE == SE_ORANGEBOXVALVE
+	
+	void OnEmitSound(IRecipientFilter& filter, int iEntIndex, int iChannel, const char *pSample, float flVolume, 
+		soundlevel_t iSoundlevel, int iFlags, int iPitch, int iSpecialDSP, const Vector *pOrigin, 
+		const Vector *pDirection, CUtlVector<Vector> *pUtlVecOrigins, bool bUpdatePositions, 
+		float soundtime, int speakerentity);
+	void OnEmitSound2(IRecipientFilter& filter, int iEntIndex, int iChannel, const char *pSample, float flVolume, 
+		float flAttenuation, int iFlags, int iPitch, int iSpecialDSP, const Vector *pOrigin, 
+		const Vector *pDirection, CUtlVector<Vector> *pUtlVecOrigins, bool bUpdatePositions, 
+		float soundtime, int speakerentity);
+#else
 	void OnEmitSound(IRecipientFilter& filter, int iEntIndex, int iChannel, const char *pSample, float flVolume, 
 		soundlevel_t iSoundlevel, int iFlags, int iPitch, const Vector *pOrigin, 
 		const Vector *pDirection, CUtlVector<Vector> *pUtlVecOrigins, bool bUpdatePositions, 
@@ -71,7 +82,8 @@ public:
 		float flAttenuation, int iFlags, int iPitch, const Vector *pOrigin, 
 		const Vector *pDirection, CUtlVector<Vector> *pUtlVecOrigins, bool bUpdatePositions, 
 		float soundtime, int speakerentity);
-#endif
+#endif // SOURCE_ENGINE == SE_ORANGEBOXVALVE
+#endif // SOURCE_ENGINE >= SE_PORTAL2
 private:
 	size_t _FillInPlayers(int *pl_array, IRecipientFilter *pFilter);
 	void _IncRefCounter(int type);