diff --git a/Source/Core/Core/Src/HW/EXI_Device.h b/Source/Core/Core/Src/HW/EXI_Device.h
index 3328d41124..2571b6e5fa 100644
--- a/Source/Core/Core/Src/HW/EXI_Device.h
+++ b/Source/Core/Core/Src/HW/EXI_Device.h
@@ -24,7 +24,7 @@ class IEXIDevice
 {
 private:
 	// Byte transfer function for this device
-	virtual void TransferByte(u8& _byte) {};
+	virtual void TransferByte(u8&) {};
 
 public:
 	// Immediate copy functions
diff --git a/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/DSoundStream.cpp b/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/DSoundStream.cpp
index 839d6ca345..d387036fab 100644
--- a/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/DSoundStream.cpp
+++ b/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/DSoundStream.cpp
@@ -110,8 +110,7 @@ void DSound::SoundLoop() {
 		// No blocking inside the csection
 		soundCriticalSection->Enter();
 		dsBuffer->GetCurrentPosition((DWORD*)&currentPos, 0);
-		int numBytesToRender = FIX128(
-			ModBufferSize(currentPos - lastPos));
+		int numBytesToRender = FIX128(ModBufferSize(currentPos - lastPos));
 
 		if (numBytesToRender >= 256)
 		{
diff --git a/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/Mixer.cpp b/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/Mixer.cpp
index f94d835030..d777166505 100644
--- a/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/Mixer.cpp
+++ b/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/Mixer.cpp
@@ -68,13 +68,7 @@ void Mixer(short *buffer, int numSamples, int bits, int rate, int channels)
 		g_dspInitialize.pGetAudioStreaming(buffer, numSamples);
 	}
 
-	//if this was called directly from the HLE, and not by timeout
-	if (g_Config.m_EnableHLEAudio && mixer_HLEready)
-	{
-		IUCode* pUCode = CDSPHandler::GetInstance().GetUCode();
-		if (pUCode != NULL)
-			pUCode->MixAdd(buffer, numSamples);
-	}
+	Mixer_MixUCode(buffer, numSamples, bits, rate, channels);
 
 	push_sync.Enter();
 	int count = 0;
@@ -96,6 +90,17 @@ void Mixer(short *buffer, int numSamples, int bits, int rate, int channels)
 	push_sync.Leave();
 }
 
+void Mixer_MixUCode(short *buffer, int numSamples, int bits, int rate, 
+					int channels) {
+	//if this was called directly from the HLE, and not by timeout
+	if (g_Config.m_EnableHLEAudio && mixer_HLEready)
+	{
+		IUCode* pUCode = CDSPHandler::GetInstance().GetUCode();
+		if (pUCode != NULL)
+			pUCode->MixAdd(buffer, numSamples);
+	}
+}
+
 void Mixer_PushSamples(short *buffer, int num_stereo_samples, int sample_rate) {
 //	static FILE *f; 
 //	if (!f)
diff --git a/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/Mixer.h b/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/Mixer.h
index 3c5095ab70..49603919f8 100644
--- a/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/Mixer.h
+++ b/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/Mixer.h
@@ -23,6 +23,8 @@ extern volatile bool mixer_HLEready;
 // Called from audio threads
 void Mixer(short* buffer, int numSamples, int bits, int rate, int channels);
 
+void Mixer_MixUCode(short *buffer, int numSamples, int bits, int rate, int channels);
+
 // Called from main thread
 void Mixer_PushSamples(short *buffer, int num_stereo_samples, int sample_rate);
 
diff --git a/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/NullSoundStream.h b/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/NullSoundStream.h
index c5c52c4f87..bd6728b1ae 100644
--- a/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/NullSoundStream.h
+++ b/Source/Plugins/Plugin_DSP_HLE/Src/PCHW/NullSoundStream.h
@@ -33,6 +33,10 @@ public:
     }  
 
 	virtual bool Start() { return true; }
+
+	virtual void Update() { 
+		(*callback)(NULL, 256 >> 2, 16, sampleRate, 2); 
+	}
 };
 
 #endif //__NULLSOUNDSTREAM_H__
diff --git a/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_AX.cpp b/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_AX.cpp
index 66acd50362..6cb7aed966 100644
--- a/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_AX.cpp
+++ b/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_AX.cpp
@@ -326,7 +326,7 @@ void CUCode_AX::MixAdd(short* _pBuffer, int _iSize)
 
 #if defined(HAVE_WX) && HAVE_WX
 	// write logging data to debugger
-	if (m_frame)
+	if (m_frame && _pBuffer)
 	{
 		CUCode_AX::Logging(_pBuffer, _iSize, 0, false);
 	}
@@ -383,22 +383,23 @@ void CUCode_AX::MixAdd(short* _pBuffer, int _iSize)
 	// write back out pbs
 	WriteBackPBs(m_addressPBs, PBs, numberOfPBs);
 
-	for (int i = 0; i < _iSize; i++)
-	{
-		// Clamp into 16-bit. Maybe we should add a volume compressor here.
-		int left  = templbuffer[i] + _pBuffer[0];
-		int right = temprbuffer[i] + _pBuffer[1];
-		if (left < -32767)  left = -32767;
-		if (left > 32767)   left = 32767;
-		if (right < -32767) right = -32767;
-		if (right >  32767) right = 32767;
-		*_pBuffer++ = left;
-		*_pBuffer++ = right;
+	if(_pBuffer) {
+		for (int i = 0; i < _iSize; i++)
+		{
+			// Clamp into 16-bit. Maybe we should add a volume compressor here.
+			int left  = templbuffer[i] + _pBuffer[0];
+			int right = temprbuffer[i] + _pBuffer[1];
+			if (left < -32767)  left = -32767;
+			if (left > 32767)   left = 32767;
+			if (right < -32767) right = -32767;
+			if (right >  32767) right = 32767;
+			*_pBuffer++ = left;
+			*_pBuffer++ = right;
+		}
 	}
-
 #if defined(HAVE_WX) && HAVE_WX
 	// write logging data to debugger again after the update
-	if (m_frame)
+	if (m_frame && _pBuffer)
 	{
 		CUCode_AX::Logging(_pBuffer, _iSize, 1, false);
 	}
diff --git a/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_AXWii.cpp b/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_AXWii.cpp
index 1ba421a90a..ed7be21fde 100644
--- a/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_AXWii.cpp
+++ b/Source/Plugins/Plugin_DSP_HLE/Src/UCodes/UCode_AXWii.cpp
@@ -110,7 +110,7 @@ void CUCode_AXWii::MixAdd_(short* _pBuffer, int _iSize, ParamBlockType &PBs)
 	// -------------------------------------------
 	// write logging data to debugger
 #if defined(HAVE_WX) && HAVE_WX
-	if (m_frame)
+	if (m_frame && _pBuffer)
 	{
 		lCUCode_AX->Logging(_pBuffer, _iSize, 0, true);
 
@@ -199,22 +199,25 @@ void CUCode_AXWii::MixAdd_(short* _pBuffer, int _iSize, ParamBlockType &PBs)
 
 	WriteBackPBsWii(m_addressPBs, PBs, numberOfPBs);
 	// We write the sound to _pBuffer
-	for (int i = 0; i < _iSize; i++)
+	if(_pBuffer)
 	{
-		// Clamp into 16-bit. Maybe we should add a volume compressor here.
-		int left  = templbuffer[i] + _pBuffer[0];
-		int right = temprbuffer[i] + _pBuffer[1];
-		if (left < -32767)  left = -32767;
-		if (left > 32767)   left = 32767;
-		if (right < -32767) right = -32767;
-		if (right >  32767) right = 32767;
-		*_pBuffer++ = left;
-		*_pBuffer++ = right;
+		for (int i = 0; i < _iSize; i++)
+		{
+			// Clamp into 16-bit. Maybe we should add a volume compressor here.
+			int left  = templbuffer[i] + _pBuffer[0];
+			int right = temprbuffer[i] + _pBuffer[1];
+			if (left < -32767)  left = -32767;
+			if (left > 32767)   left = 32767;
+			if (right < -32767) right = -32767;
+			if (right >  32767) right = 32767;
+			*_pBuffer++ = left;
+			*_pBuffer++ = right;
+		}
 	}
-
+	
 #if defined(HAVE_WX) && HAVE_WX
 	// write logging data to debugger again after the update
-	if (m_frame)
+	if (m_frame && _pBuffer)
 	{
 		lCUCode_AX->Logging(_pBuffer, _iSize, 1, true);
 	}
diff --git a/Source/Plugins/Plugin_DSP_HLE/Src/main.cpp b/Source/Plugins/Plugin_DSP_HLE/Src/main.cpp
index 35d2b657d3..6ace114da8 100644
--- a/Source/Plugins/Plugin_DSP_HLE/Src/main.cpp
+++ b/Source/Plugins/Plugin_DSP_HLE/Src/main.cpp
@@ -232,7 +232,7 @@ void Initialize(void *init)
 		if (AOSound::isValid())
 			soundStream = new AOSound(48000, Mixer);
 	} else if(strncasecmp(g_Config.sBackend, "NullSound", 10) == 0) {
-		soundStream = new NullSound(48000, Mixer);
+		soundStream = new NullSound(48000, Mixer_MixUCode);
 	} else {
 		PanicAlert("Cannot recognize backend %s", g_Config.sBackend);
 		return;