diff --git a/Core/HLE/sceSas.cpp b/Core/HLE/sceSas.cpp
index 06cc9533d8..28b0e8e46f 100644
--- a/Core/HLE/sceSas.cpp
+++ b/Core/HLE/sceSas.cpp
@@ -379,12 +379,17 @@ u32 sceSasSetADSRMode(u32 core, int voiceNum,int flag ,int a, int d, int s, int
 
 
 u32 sceSasSetSimpleADSR(u32 core, int voiceNum, u32 ADSREnv1, u32 ADSREnv2) {
-	DEBUG_LOG(SCESAS, "sasSetSimpleADSR(%08x, %i, %08x, %08x)", core, voiceNum, ADSREnv1, ADSREnv2);
-
 	if (voiceNum >= PSP_SAS_VOICES_MAX || voiceNum < 0)	{
 		WARN_LOG(SCESAS, "%s: invalid voicenum %d", __FUNCTION__, voiceNum);
 		return ERROR_SAS_INVALID_VOICE;
 	}
+	// This bit could be related to decay type or systain type, but gives an error if you try to set it.
+	if ((ADSREnv2 >> 13) & 1) {
+		WARN_LOG_REPORT(SCESAS, "sceSasSetSimpleADSR(%08x, %d, %04x, %04x): Invalid ADSREnv2", core, voiceNum, ADSREnv1, ADSREnv2);
+		return ERROR_SAS_INVALID_ADSR_CURVE_MODE;
+	}
+
+	DEBUG_LOG(SCESAS, "sasSetSimpleADSR(%08x, %i, %08x, %08x)", core, voiceNum, ADSREnv1, ADSREnv2);
 
 	SasVoice &v = sas->voices[voiceNum];
 	v.envelope.SetSimpleEnvelope(ADSREnv1 & 0xFFFF, ADSREnv2 & 0xFFFF);
diff --git a/Core/HLE/sceUtility.cpp b/Core/HLE/sceUtility.cpp
index 32b145fbd4..b8346db98d 100644
--- a/Core/HLE/sceUtility.cpp
+++ b/Core/HLE/sceUtility.cpp
@@ -396,7 +396,7 @@ int sceUtilityNetconfInitStart(u32 paramsAddr)
 int sceUtilityNetconfShutdownStart(unsigned int unknown)
 {
 	if (currentDialogType != UTILITY_DIALOG_NET) {
-		WARN_LOG(SCEUTILITY, "sceUtilityNetconfShutdownStartt(): wrong dialog type");
+		WARN_LOG(SCEUTILITY, "sceUtilityNetconfShutdownStart(): wrong dialog type");
 		return SCE_ERROR_UTILITY_WRONG_TYPE;
 	}
 	currentDialogActive = false;
diff --git a/Core/HW/SasAudio.cpp b/Core/HW/SasAudio.cpp
index 131ddb5575..32213a17fd 100644
--- a/Core/HW/SasAudio.cpp
+++ b/Core/HW/SasAudio.cpp
@@ -218,7 +218,7 @@ void SasAtrac3::DoState(PointerWrap &p) {
 
 // http://code.google.com/p/jpcsp/source/browse/trunk/src/jpcsp/HLE/modules150/sceSasCore.java
 
-int simpleRate(int n) {
+static int simpleRate(int n) {
 	n &= 0x7F;
 	if (n == 0x7F) {
 		return 0;
@@ -230,6 +230,18 @@ int simpleRate(int n) {
 	return rate;
 }
 
+static int exponentRate(int n) {
+	n &= 0x7F;
+	if (n == 0x7F) {
+		return 0;
+	}
+	int rate = ((7 - (n & 0x3)) << 24) >> (n >> 2);
+	if (rate == 0) {
+		return 1;
+	}
+	return rate;
+}
+
 static int getAttackRate(int bitfield1) {
 	return simpleRate(bitfield1 >> 8);
 }
@@ -239,22 +251,22 @@ static int getAttackType(int bitfield1) {
 }
 
 static int getDecayRate(int bitfield1) {
-	return 0x80000000 >> ((bitfield1 >> 4) & 0x000F);
-}
-
-static int getSustainRate(int bitfield2) {
-	return simpleRate(bitfield2 >> 6);
+	int n = (bitfield1 >> 4) & 0x000F;
+	if (n == 0)
+		return 0x7FFFFFFF;
+	return 0x80000000 >> n;
 }
 
 static int getSustainType(int bitfield2) {
-	switch (bitfield2 >> 13) {
-	case 0: return PSP_SAS_ADSR_CURVE_MODE_LINEAR_INCREASE;
-	case 2: return PSP_SAS_ADSR_CURVE_MODE_LINEAR_DECREASE;
-	case 4: return PSP_SAS_ADSR_CURVE_MODE_LINEAR_BENT;
-	case 6: return PSP_SAS_ADSR_CURVE_MODE_EXPONENT_DECREASE;
+	return (bitfield2 >> 14) & 3;
+}
+
+static int getSustainRate(int bitfield2) {
+	if (getSustainType(bitfield2) == PSP_SAS_ADSR_CURVE_MODE_EXPONENT_DECREASE) {
+		return exponentRate(bitfield2 >> 6);
+	} else {
+		return simpleRate(bitfield2 >> 6);
 	}
-	ERROR_LOG(SASMIX,"sasSetSimpleADSR,ERROR_SAS_INVALID_ADSR_CURVE_MODE");
-	return 0;
 }
 
 static int getReleaseType(int bitfield2) {
@@ -267,9 +279,14 @@ static int getReleaseRate(int bitfield2) {
 		return 0;
 	}
 	if (getReleaseType(bitfield2) == PSP_SAS_ADSR_CURVE_MODE_LINEAR_DECREASE) {
-		return (0x40000000 >> (n + 2));
+		if (n == 30) {
+			return 0x40000000;
+		} else if (n == 29) {
+			return 1;
+		}
+		return 0x10000000 >> n;
 	}
-	return (0x40000000 >> n);
+	return 0x80000000 >> n;
 }
 
 static int getSustainLevel(int bitfield1) {