diff --git a/Core/HLE/sceAtrac.cpp b/Core/HLE/sceAtrac.cpp
index caabe6d04b..ec153ba706 100644
--- a/Core/HLE/sceAtrac.cpp
+++ b/Core/HLE/sceAtrac.cpp
@@ -91,6 +91,7 @@ struct InputBuffer {
 
 struct Atrac;
 int __AtracSetContext(Atrac *atrac);
+void _AtracGenarateContext(Atrac *atrac, SceAtracId *context);
 
 struct AtracLoopInfo {
 	int cuePointID;
@@ -178,9 +179,6 @@ struct Atrac {
 		p.Do(loopEndSample);
 		p.Do(loopNum);
 
-		// Is NULL okay for this?
-		if (p.mode == p.MODE_READ)
-			decoder_context = 0;
 		p.Do(atracContext);
 
 		p.DoMarker("Atrac");
@@ -465,6 +463,24 @@ u32 sceAtracGetAtracID(int codecType)
 	return atracID;
 }
 
+u32 _AtracAddStreamData(int atracID, u8 *buf, u32 bytesToAdd) {
+	Atrac *atrac = getAtrac(atracID);
+	if (!atrac)
+		return 0;
+	int addbytes = std::min(bytesToAdd, atrac->first.filesize - atrac->first.fileoffset);
+	memcpy(atrac->data_buf + atrac->first.fileoffset, buf, addbytes);
+	atrac->first.size += bytesToAdd;
+	if (atrac->first.size > atrac->first.filesize)
+		atrac->first.size = atrac->first.filesize;
+	atrac->first.fileoffset = atrac->first.size;
+	atrac->first.writableBytes = 0;
+	if (atrac->atracContext.Valid()) {
+		// refresh atracContext
+		_AtracGenarateContext(atrac, atrac->atracContext);
+	}
+	return 0;
+}
+
 // PSP allow games to add stream data to a temp buf, the buf size is given by "atracBufSize "here.
 // "first.offset" means how many bytes the temp buf has been written,
 // and "first.writableBytes" means how many bytes the temp buf is allowed to write
@@ -611,6 +627,10 @@ u32 _AtracDecodeData(int atracID, u8* outbuf, u32 *SamplesNum, u32* finish, int
 			*finish = finishFlag;
 			*remains = atrac->getRemainFrames();
 		}
+		if (atrac->atracContext.Valid()) {
+			// refresh atracContext
+			_AtracGenarateContext(atrac, atrac->atracContext);
+		}
 	// TODO: Can probably remove this after we validate no wrong ids?
 	} else {
 		memset(outbuf, 0, ATRAC3_MAX_SAMPLES * sizeof(s16) * atrac->atracOutputChannels);
@@ -1276,11 +1296,13 @@ int _AtracGetIDByContext(u32 contextAddr) {
 void _AtracGenarateContext(Atrac *atrac, SceAtracId *context) {
 	context->info.buffer = atrac->first.addr;
 	context->info.bufferByte = atrac->atracBufSize;
+	context->info.secondBuffer = atrac->second.addr;
+	context->info.secondBufferByte = atrac->second.size;
 	context->info.codec = atrac->codeType;
 	context->info.loopNum = atrac->loopNum;
 	context->info.loopStart = atrac->loopStartSample > 0 ? atrac->loopStartSample : 0;
 	context->info.loopEnd = atrac->loopEndSample > 0 ? atrac->loopEndSample : 0;
-	if (atrac->first.size >= atrac->first.fileoffset) {
+	if (atrac->first.size >= atrac->first.filesize) {
 		// state 2, all data loaded
 		context->info.state = 2;
 	} else if (atrac->loopinfoNum == 0) {
@@ -1297,6 +1319,7 @@ void _AtracGenarateContext(Atrac *atrac, SceAtracId *context) {
 	context->info.endSample = atrac->endSample;
 	context->info.dataEnd = atrac->first.filesize;
 	context->info.curOff = atrac->first.size;
+	context->info.decodePos = atrac->getDecodePosBySample(atrac->currentSample);
 	context->info.streamDataByte = atrac->first.size - atrac->firstSampleoffset;
 
 	u8* buf = (u8*)context;
diff --git a/Core/HLE/sceAtrac.h b/Core/HLE/sceAtrac.h
index 71e2b801d9..1775100c64 100644
--- a/Core/HLE/sceAtrac.h
+++ b/Core/HLE/sceAtrac.h
@@ -66,5 +66,6 @@ typedef struct
 
 // provide some decoder interface
 
+u32 _AtracAddStreamData(int atracID, u8 *buf, u32 bytesToAdd);
 u32 _AtracDecodeData(int atracID, u8* outbuf, u32 *SamplesNum, u32* finish, int *remains);
 int _AtracGetIDByContext(u32 contextAddr);
\ No newline at end of file
diff --git a/Core/HLE/sceSas.cpp b/Core/HLE/sceSas.cpp
index 798801ea93..19e6fcc6bd 100644
--- a/Core/HLE/sceSas.cpp
+++ b/Core/HLE/sceSas.cpp
@@ -435,21 +435,25 @@ u32 sceSasSetSteepWave(u32 sasCore, int voice, int unknown) {
 u32 __sceSasSetVoiceATRAC3(u32 core, int voiceNum, u32 atrac3Context) {
 	INFO_LOG_REPORT(HLE, "__sceSasSetVoiceATRAC3(%08x, %i, %08x)", core, voiceNum, atrac3Context);
 	SasVoice &v = sas->voices[voiceNum];
-	u32 prevPcmAddr = v.pcmAddr;
 	v.type = VOICETYPE_ATRAC3;
 	v.loop = false;
 	v.playing = true;
 	v.atrac3.setContext(atrac3Context);
+	Memory::Write_U32(atrac3Context, core + 56 * voiceNum + 20);
 	return 0;
 }
 
-u32 __sceSasConcatenateATRAC3(u32 core, int voice, u32 atrac3DataAddr, int atrac3DataLength) {
-	ERROR_LOG_REPORT(HLE, "UNIMPL __sceSasConcatenateATRAC3(%08x, %i, %08x, %i)", core, voice, atrac3DataAddr, atrac3DataLength);
+u32 __sceSasConcatenateATRAC3(u32 core, int voiceNum, u32 atrac3DataAddr, int atrac3DataLength) {
+	INFO_LOG_REPORT(HLE, "__sceSasConcatenateATRAC3(%08x, %i, %08x, %i)", core, voiceNum, atrac3DataAddr, atrac3DataLength);
+	SasVoice &v = sas->voices[voiceNum];
+	if (Memory::IsValidAddress(atrac3DataAddr))
+		v.atrac3.addStreamData(Memory::GetPointer(atrac3DataAddr), atrac3DataLength);
 	return 0;
 }
 
-u32 __sceSasUnsetATRAC3(u32 core, int voice) {
-	ERROR_LOG_REPORT(HLE, "UNIMPL __sceSasUnsetATRAC3(%08x, %i)", core, voice);
+u32 __sceSasUnsetATRAC3(u32 core, int voiceNum) {
+	INFO_LOG_REPORT(HLE, "__sceSasUnsetATRAC3(%08x, %i)", core, voiceNum);
+	Memory::Write_U32(0, core + 56 * voiceNum + 20);
 	return 0;
 }
 
diff --git a/Core/HW/SasAudio.cpp b/Core/HW/SasAudio.cpp
index 88f6181acf..5cfa467412 100644
--- a/Core/HW/SasAudio.cpp
+++ b/Core/HW/SasAudio.cpp
@@ -181,6 +181,13 @@ int SasAtrac3::getNextSamples(s16* outbuf, int wantedSamples) {
 	return finish;
 }
 
+int SasAtrac3::addStreamData(u8* buf, u32 addbytes) {
+	if (atracID > 0) {
+		_AtracAddStreamData(atracID, buf, addbytes);
+	}
+	return 0;
+}
+
 void SasAtrac3::DoState(PointerWrap &p) {
 	p.Do(contextAddr);
 	p.Do(atracID);
diff --git a/Core/HW/SasAudio.h b/Core/HW/SasAudio.h
index 0026053d87..32bf972762 100644
--- a/Core/HW/SasAudio.h
+++ b/Core/HW/SasAudio.h
@@ -114,6 +114,7 @@ public:
 	~SasAtrac3() { if (sampleQueue) delete sampleQueue; }
 	int setContext(u32 context);
 	int getNextSamples(s16* outbuf, int wantedSamples);
+	int addStreamData(u8* buf, u32 addbytes);
 	void DoState(PointerWrap &p);
 private:
 	u32 contextAddr;