diff --git a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AX.cpp b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AX.cpp
index 3170deedde..3083fea1a4 100644
--- a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AX.cpp
+++ b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AX.cpp
@@ -36,6 +36,8 @@ CUCode_AX::CUCode_AX(DSPHLE *dsp_hle)
 
 	templbuffer = new int[1024 * 1024];
 	temprbuffer = new int[1024 * 1024];
+
+	mptHack = _CRC == 0x3389a79e;
 }
 
 CUCode_AX::~CUCode_AX()
@@ -172,8 +174,11 @@ void CUCode_AX::MixAdd(short* _pBuffer, int _iSize)
 			if (!ReadPB(blockAddr, PB))
 				break;
 
-			ProcessUpdates(PB);
-			VoiceHacks(PB);
+			if (!mptHack)
+			{		
+				ProcessUpdates(PB);
+				VoiceHacks(PB);
+			}
 			MixAddVoice(PB, templbuffer, temprbuffer, _iSize);
 
 			if (!WritePB(blockAddr, PB))
diff --git a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AX.h b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AX.h
index 3ad87c228f..4007cadd9a 100644
--- a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AX.h
+++ b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCode_AX.h
@@ -42,6 +42,7 @@ public:
 	u32 PBaddr[8]; //2 needed for MP2
 	u32 m_addressPBs;
 	u32 _CRC;
+	bool mptHack;
 
 private:
 	enum
diff --git a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCodes.cpp b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCodes.cpp
index bb7125a612..556ac2d828 100644
--- a/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCodes.cpp
+++ b/Source/Core/Core/Src/HW/DSPHLE/UCodes/UCodes.cpp
@@ -55,6 +55,7 @@ IUCode* UCodeFactory(u32 _CRC, DSPHLE *dsp_hle, bool bWii)
 	case 0x07f88145: // bustamove, ikaruga, fzero, robotech battle cry, star soldier, soul calibur2,
 					 // Zelda:OOT, Tony hawk, viewtiful joe
 	case 0xe2136399: // billy hatcher, dragonballz, mario party 5, TMNT, ava1080
+	case 0x3389a79e: // MP1/MP2 Wii (Metroid Prime Trilogy)
 		INFO_LOG(DSPHLE, "CRC %08x: AX ucode chosen", _CRC);
 		return new CUCode_AX(dsp_hle);