KYRA/TOWNS: some minor sound improvements

(some cleanup to internal driver volume control, minor frequency change for fm-towns)

svn-id: r51930

6 files changed, 115 insertions, 87 deletions

diff --git a/sound/softsynth/fmtowns_pc98/towns_audio.cpp b/sound/softsynth/fmtowns_pc98/towns_audio.cpp
index 42b9be804e..c9ba03ea27 100644
--- a/sound/softsynth/fmtowns_pc98/towns_audio.cpp
+++ b/sound/softsynth/fmtowns_pc98/towns_audio.cpp
@@ -104,7 +104,7 @@ TownsAudioInterface::TownsAudioInterface(Audio::Mixer *mixer, TownsAudioInterfac
 	_fmInstruments(0), _pcmInstruments(0), _pcmChan(0), _waveTables(0), _waveTablesTotalDataSize(0),
 	_baserate(55125.0f / (float)mixer->getOutputRate()), _tickLength(0), _timer(0), _drv(driver),
 	_pcmSfxChanMask(0),	_musicVolume(Audio::Mixer::kMaxMixerVolume), _sfxVolume(Audio::Mixer::kMaxMixerVolume),
-	_cdaVolFlags(0), _ready(false) {
+	_outputVolumeFlags(0), _outputMuteFlags(0), _ready(false) {
 
 #define INTCB(x) &TownsAudioInterface::intf_##x
 	static const TownsAudioIntfCallback intfCb[] = {
@@ -192,11 +192,11 @@ TownsAudioInterface::TownsAudioInterface(Audio::Mixer *mixer, TownsAudioInterfac
 		INTCB(notImpl),
 		INTCB(notImpl),
 		INTCB(notImpl),
-		INTCB(cdaSetVolume),
+		INTCB(setOutputVolume),
 		// 68
-		INTCB(cdaReset),
-		INTCB(notImpl),
+		INTCB(resetOutputVolume),
 		INTCB(notImpl),
+		INTCB(updateOutputVolume),
 		INTCB(notImpl),
 		// 72
 		INTCB(notImpl),
@@ -218,6 +218,8 @@ TownsAudioInterface::TownsAudioInterface(Audio::Mixer *mixer, TownsAudioInterfac
 	_intfOpcodes = intfCb;
 
 	memset(_fmSaveReg, 0, sizeof(_fmSaveReg));
+	memset(_outputLevel, 0, sizeof(_outputLevel));
+
 	_timerBase = (uint32)(_baserate * 1000000.0f);
 	_tickLength = 2 * _timerBase;
 }
@@ -286,7 +288,7 @@ void TownsAudioInterface::setSoundEffectVolume(int volume) {
 	setVolumeIntern(_musicVolume, _sfxVolume);
 }
 
-void TownsAudioInterface::setSoundEffectChanMask(uint32 mask) {
+void TownsAudioInterface::setSoundEffectChanMask(int mask) {
 	_pcmSfxChanMask = mask >> 6;
 	mask &= 0x3f;
 	setVolumeChannelMasks(~mask, mask);
@@ -298,8 +300,8 @@ void TownsAudioInterface::nextTickEx(int32 *buffer, uint32 bufferSize) {
 
 	for (uint32 i = 0; i < bufferSize; i++) {
 		_timer += _tickLength;
-		while (_timer > 0x5B8D80) {
-			_timer -= 0x5B8D80;
+		while (_timer > 0x514767) {
+			_timer -= 0x514767;
 
 			for (int ii = 0; ii < 8; ii++) {
 				if ((_pcmChanKeyPlaying & _chanFlags[ii]) || (_pcmChanEffectPlaying & _chanFlags[ii])) {
@@ -361,7 +363,7 @@ int TownsAudioInterface::intf_reset(va_list &args) {
 	Common::StackLock lock(_mutex);
 	fmReset();
 	pcmReset();
-	cdaReset();
+	callback(68);
 	return 0;
 }
 
@@ -708,56 +710,59 @@ int TownsAudioInterface::intf_fmReset(va_list &args) {
 	return 0;
 }
 
-int TownsAudioInterface::intf_cdaReset(va_list &args) {
-	cdaReset();
-	return 0;
-}
-
-int TownsAudioInterface::intf_pcmUpdateEnvelopeGenerator(va_list &args) {
-	for (int i = 0; i < 8; i++)
-		pcmUpdateEnvelopeGenerator(i);
-	return 0;
-}
-
-int TownsAudioInterface::intf_cdaSetVolume(va_list &args) {
-	int mode = va_arg(args, int);
+int TownsAudioInterface::intf_setOutputVolume(va_list &args) {
+	int chanType = va_arg(args, int);
 	int left = va_arg(args, int);
 	int right = va_arg(args, int);
 
-	// calculate mixer balance value
-	int8 balance = right - left;
-
 	if (left & 0xff80 || right & 0xff80)
 		return 3;
 
 	static const uint8 flags[] = { 0x0C, 0x30, 0x40, 0x80 };
 
-	//int a = (mode & 0x40) ? 4 : 0;
-	int b = mode & 3;
+	uint8 chan = (chanType & 0x40) ? 8 : 12;
+	
+	chanType &= 3;
 	left = (left & 0x7e) >> 1;
 	right = (right & 0x7e) >> 1;
 	
-	if (mode & 0x40)
-		_cdaVolFlags |= flags[b];
+	if (chan)
+		_outputVolumeFlags |= flags[chanType];
 	else
-		_cdaVolFlags &= ~flags[b];
+		_outputVolumeFlags &= ~flags[chanType];
 
-	if (mode > 1) {
-		// Unknown purpose / TODO
+	if (chanType > 1) {
+		_outputLevel[chan + chanType] = left;
+	} else {
+		if (chanType == 0)
+			chan -= 8;
+		_outputLevel[chan] = left;
+		_outputLevel[chan + 1] = right;
+	}
 
-	} else if (mode == 1) {
-		// FM Towns seems to support volumes of 0 - 63 for each channel.
-		// We recalculate sane values for out 0 to 255 volume range.
+	updateOutputVolume();
 
-		int vl = (int)(((float)left * 255.0f) / 63.0f);
-		int vr = (int)(((float)right * 255.0f) / 63.0f);
-		AudioCD.setVolume((vl + vr) >> 1);
-		AudioCD.setBalance(balance);
+	return 0;
+}
 
-	} else {
-		// Unknown purpose / TODO
-	}
+int TownsAudioInterface::intf_resetOutputVolume(va_list &args) {
+	memset(_outputLevel, 0, sizeof(_outputLevel));
+	_outputMuteFlags = 0;
+	_outputVolumeFlags = 0;
+	updateOutputVolume();
+	return 0;
+}
 
+int TownsAudioInterface::intf_updateOutputVolume(va_list &args) {
+	int flags = va_arg(args, int);
+	_outputMuteFlags = flags & 3;
+	updateOutputVolume();
+	return 0;
+}
+
+int TownsAudioInterface::intf_pcmUpdateEnvelopeGenerator(va_list &args) {
+	for (int i = 0; i < 8; i++)
+		pcmUpdateEnvelopeGenerator(i);
 	return 0;
 }
 
@@ -1382,8 +1387,19 @@ void TownsAudioInterface::pcmCalcPhaseStep(TownsAudio_PcmChannel *p, TownsAudio_
 	p->step = (s * p->stepPitch) >> 14;
 }
 
-void TownsAudioInterface::cdaReset() {
-
+void TownsAudioInterface::updateOutputVolume() {
+	// FM Towns seems to support volumes of 0 - 63 for each channel.
+	// We recalculate sane values for our 0 to 255 volume range and
+	// balance values for our -128 to 127 volume range
+	
+	// CD-AUDIO
+	int vl = (int)(((float)_outputLevel[12] * 127.0f) / 63.0f);
+	int vr = (int)(((float)_outputLevel[13] * 127.0f) / 63.0f);
+	int8 balance = vr - vl;
+	vl = (int)(((float)_outputLevel[12] * 255.0f) / 63.0f);
+	vr = (int)(((float)_outputLevel[13] * 255.0f) / 63.0f);
+	AudioCD.setVolume((vl + vr) >> 1);
+	AudioCD.setBalance(balance);
 }
 
 const uint8 TownsAudioInterface::_chanFlags[] = {
@@ -1457,7 +1473,7 @@ void TownsAudio_PcmChannel::clear() {
 	stepNote = 0x4000;
 	stepPitch = 0x4000;
 
-	panLeft = panRight = 0;
+	panLeft = panRight = 7;
 
 	envTotalLevel = envAttackRate = envDecayRate = envSustainLevel = envSustainRate = envReleaseRate = 0;
 	envStep = envCurrentLevel = 0;
diff --git a/sound/softsynth/fmtowns_pc98/towns_audio.h b/sound/softsynth/fmtowns_pc98/towns_audio.h
index 212c00c40f..950c016b4e 100644
--- a/sound/softsynth/fmtowns_pc98/towns_audio.h
+++ b/sound/softsynth/fmtowns_pc98/towns_audio.h
@@ -50,7 +50,7 @@ public:
 	void setSoundEffectVolume(int volume);
 	// Defines the channels used as sound effect channels for the purpose of ScummVM GUI volume control.
 	// The first 6 bits are the 6 fm channels. The next 8 bits are pcm channels.
-	void setSoundEffectChanMask(uint32 mask);
+	void setSoundEffectChanMask(int mask);
 
 private:
 	void nextTickEx(int32 *buffer, uint32 bufferSize);
@@ -92,8 +92,9 @@ private:
 	int intf_fmSetPitch(va_list &args);
 	int intf_fmSetLevel(va_list &args);
 	int intf_fmReset(va_list &args);
-	int intf_cdaSetVolume(va_list &args);
-	int intf_cdaReset(va_list &args);
+	int intf_setOutputVolume(va_list &args);
+	int intf_resetOutputVolume(va_list &args);
+	int intf_updateOutputVolume(va_list &args);
 	int intf_pcmUpdateEnvelopeGenerator(va_list &args);
 
 	int intf_notImpl(va_list &args);
@@ -148,9 +149,10 @@ private:
 
 	void pcmCalcPhaseStep(TownsAudio_PcmChannel *p, TownsAudio_WaveTable *w);
 
-	void cdaReset();
-	
-	uint8 _cdaVolFlags;
+	void updateOutputVolume();
+	uint8 _outputVolumeFlags;
+	uint8 _outputLevel[16];
+	uint8 _outputMuteFlags;
 
 	const float _baserate;
 	uint32 _timerBase;
@@ -159,7 +161,7 @@ private:
 
 	uint16 _musicVolume;
 	uint16 _sfxVolume;
-	uint32 _pcmSfxChanMask;
+	int _pcmSfxChanMask;
 
 	TownsAudioInterfacePluginDriver *_drv;
 	bool _ready;
diff --git a/sound/softsynth/fmtowns_pc98/towns_euphony.cpp b/sound/softsynth/fmtowns_pc98/towns_euphony.cpp
index e23d5bcb36..0c0c203cc9 100644
--- a/sound/softsynth/fmtowns_pc98/towns_euphony.cpp
+++ b/sound/softsynth/fmtowns_pc98/towns_euphony.cpp
@@ -180,6 +180,10 @@ void TownsEuphonyDriver::stopParser() {
 	}
 }
 
+void TownsEuphonyDriver::continueParsing() {
+	_suspendParsing = false;
+}
+
 void TownsEuphonyDriver::playSoundEffect(int chan, int note, int velo, const uint8 *data) {
 	_intf->callback(37, chan, note, velo, data);
 }
@@ -204,7 +208,7 @@ void TownsEuphonyDriver::chanVolume(int chan, int vol) {
 	_intf->callback(8, chan, vol);
 }
 
-void TownsEuphonyDriver::cdaSetVolume(int mode, int volLeft, int volRight) {
+void TownsEuphonyDriver::setOutputVolume(int mode, int volLeft, int volRight) {
 	_intf->callback(67, mode, volLeft, volRight);
 }
 
@@ -230,7 +234,7 @@ int TownsEuphonyDriver::chanOrdr(int tableEntry, int val) {
 	return 0;
 }
 
-int TownsEuphonyDriver::chanLevel(int tableEntry, int val) {
+int TownsEuphonyDriver::chanVolumeShift(int tableEntry, int val) {
 	if (tableEntry > 31)
 		return 3;
 	if (val <= 40)
@@ -238,7 +242,7 @@ int TownsEuphonyDriver::chanLevel(int tableEntry, int val) {
 	return 0;
 }
 
-int TownsEuphonyDriver::chanTranspose(int tableEntry, int val) {
+int TownsEuphonyDriver::chanNoteShift(int tableEntry, int val) {
 	if (tableEntry > 31)
 		return 3;
 	if (val <= 40)
@@ -660,8 +664,8 @@ bool TownsEuphonyDriver::evtSetupNote() {
 	uint8 velo = _musicPos[5];
 
 	sendEvent(mode, evt);
-	sendEvent(mode, prepTranspose(note));
-	sendEvent(mode, prepVelo(velo));
+	sendEvent(mode, applyNoteShift(note));
+	sendEvent(mode, applyVolumeShift(velo));
 
 	jumpNextLoop();
 	if (_musicPos[0] == 0xfe || _musicPos[0] == 0xfd)
@@ -700,7 +704,7 @@ bool TownsEuphonyDriver::evtPolyphonicAftertouch() {
 	uint8 mode = _tMode[_musicPos[1]];
 
 	sendEvent(mode, evt);
-	sendEvent(mode, prepTranspose(_musicPos[4]));
+	sendEvent(mode, applyNoteShift(_musicPos[4]));
 	sendEvent(mode, _musicPos[5]);
 
 	return false;
@@ -768,7 +772,7 @@ bool TownsEuphonyDriver::evtModeOrdrChange() {
 	return false;
 }
 
-uint8 TownsEuphonyDriver::prepTranspose(uint8 in) {
+uint8 TownsEuphonyDriver::applyNoteShift(uint8 in) {
 	int out = _tTranspose[_musicPos[1]];
 	if (!out)
 		return in;
@@ -783,7 +787,7 @@ uint8 TownsEuphonyDriver::prepTranspose(uint8 in) {
 	return out & 0xff;
 }
 
-uint8 TownsEuphonyDriver::prepVelo(uint8 in) {
+uint8 TownsEuphonyDriver::applyVolumeShift(uint8 in) {
 	int out = _tLevel[_musicPos[1]];
 	out += (in & 0x7f);
 	out = CLIP(out, 1, 127);
diff --git a/sound/softsynth/fmtowns_pc98/towns_euphony.h b/sound/softsynth/fmtowns_pc98/towns_euphony.h
index 2026a299c1..fa1f8ba496 100644
--- a/sound/softsynth/fmtowns_pc98/towns_euphony.h
+++ b/sound/softsynth/fmtowns_pc98/towns_euphony.h
@@ -45,6 +45,8 @@ public:
 	int startMusicTrack(const uint8 *data, int trackSize, int startTick);
 	void setMusicLoop(bool loop);
 	void stopParser();
+	bool parserIsPlaying() {return _playing; }
+	void continueParsing();
 
 	void playSoundEffect(int chan, int note, int velo, const uint8 *data);
 	void stopSoundEffect(int chan);
@@ -54,13 +56,13 @@ public:
 	void chanPitch(int chan, int pitch);
 	void chanVolume(int chan, int vol);
 
-	void cdaSetVolume(int mode, int volLeft, int volRight);
+	void setOutputVolume(int chanType, int volLeft, int volRight);
 
 	int chanEnable(int tableEntry, int val);
 	int chanMode(int tableEntry, int val);
 	int chanOrdr(int tableEntry, int val);
-	int chanLevel(int tableEntry, int val);
-	int chanTranspose(int tableEntry, int val);
+	int chanVolumeShift(int tableEntry, int val);
+	int chanNoteShift(int tableEntry, int val);
 
 	int assignChannel(int chan, int tableEntry);
 
@@ -112,8 +114,8 @@ private:
 		return false;
 	}
 
-	uint8 prepTranspose(uint8 in);
-	uint8 prepVelo(uint8 in);
+	uint8 applyNoteShift(uint8 in);
+	uint8 applyVolumeShift(uint8 in);
 
 	void sendNoteOff();
 	void sendNoteOn();
diff --git a/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.cpp b/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.cpp
index 507c8e159a..241b9bde50 100644
--- a/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.cpp
+++ b/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.cpp
@@ -28,7 +28,7 @@
 
 class TownsPC98_FmSynthOperator {
 public:
-	TownsPC98_FmSynthOperator(const uint32 timerbase, const uint8 *rateTable,
+	TownsPC98_FmSynthOperator(const uint32 timerbase, const uint32 rtt, const uint8 *rateTable,
 	                          const uint8 *shiftTable, const uint8 *attackDecayTable, const uint32 *frqTable,
 	                          const uint32 *sineTable, const int32 *tlevelOut, const int32 *detuneTable);
 	~TownsPC98_FmSynthOperator() {}
@@ -108,6 +108,7 @@ protected:
 
 	const uint32 _tickLength;
 	uint32 _timer;
+	const uint32 _rtt;
 	int32 _currentLevel;
 
 	struct EvpState {
@@ -116,10 +117,10 @@ protected:
 	} fs_a, fs_d, fs_s, fs_r;
 };
 
-TownsPC98_FmSynthOperator::TownsPC98_FmSynthOperator(const uint32 timerbase, const uint8 *rateTable,
-        const uint8 *shiftTable, const uint8 *attackDecayTable, const uint32 *frqTable,
-        const uint32 *sineTable, const int32 *tlevelOut, const int32 *detuneTable) :
-	_rateTbl(rateTable), _rshiftTbl(shiftTable), _adTbl(attackDecayTable), _fTbl(frqTable),
+TownsPC98_FmSynthOperator::TownsPC98_FmSynthOperator(const uint32 timerbase, const uint32 rtt,
+		const uint8 *rateTable, const uint8 *shiftTable, const uint8 *attackDecayTable,
+		const uint32 *frqTable, const uint32 *sineTable, const int32 *tlevelOut, const int32 *detuneTable) :
+	_rtt(rtt), _rateTbl(rateTable), _rshiftTbl(shiftTable), _adTbl(attackDecayTable), _fTbl(frqTable),
 	_sinTbl(sineTable), _tLvlTbl(tlevelOut), _detnTbl(detuneTable), _tickLength(timerbase * 2),
 	_specifiedAttackRate(0), _specifiedDecayRate(0), _specifiedReleaseRate(0), _specifiedSustainRate(0),
 	_phase(0), _state(kEnvReady), _playing(false), _timer(0), _keyScale1(0),
@@ -190,8 +191,8 @@ void TownsPC98_FmSynthOperator::generateOutput(int32 phasebuf, int32 *feed, int3
 		return;
 
 	_timer += _tickLength;
-	while (_timer > 0x5B8D80) {
-		_timer -= 0x5B8D80;
+	while (_timer > _rtt) {
+		_timer -= _rtt;
 		++_tickCount;
 
 		int32 levelIncrement = 0;
@@ -308,7 +309,7 @@ bool TownsPC98_FmSynthOperator::scaleRate(uint8 value) {
 
 class TownsPC98_FmSynthSquareSineSource {
 public:
-	TownsPC98_FmSynthSquareSineSource(const uint32 timerbase);
+	TownsPC98_FmSynthSquareSineSource(const uint32 timerbase, const uint32 rtt);
 	~TownsPC98_FmSynthSquareSineSource();
 
 	void init(const int *rsTable, const int *rseTable);
@@ -351,6 +352,7 @@ private:
 
 	const uint32 _tickLength;
 	uint32 _timer;
+	const uint32 _rtt;
 
 	struct Channel {
 		int tick;
@@ -377,7 +379,7 @@ private:
 
 class TownsPC98_FmSynthPercussionSource {
 public:
-	TownsPC98_FmSynthPercussionSource(const uint32 timerbase);
+	TownsPC98_FmSynthPercussionSource(const uint32 timerbase, const uint32 rtt);
 	~TownsPC98_FmSynthPercussionSource() {
 		delete[] _reg;
 	}
@@ -429,6 +431,7 @@ private:
 
 	const uint32 _tickLength;
 	uint32 _timer;
+	const uint32 _rtt;
 
 	uint8 **_reg;
 
@@ -440,8 +443,8 @@ private:
 	bool _ready;
 };
 
-TownsPC98_FmSynthSquareSineSource::TownsPC98_FmSynthSquareSineSource(const uint32 timerbase) : _tlTable(0),
-	_tleTable(0), _updateRequest(-1), _tickLength(timerbase * 27), _ready(0), _reg(0), _rand(1), _outN(1),
+TownsPC98_FmSynthSquareSineSource::TownsPC98_FmSynthSquareSineSource(const uint32 timerbase, const uint32 rtt) : _tlTable(0),
+	_rtt(rtt), _tleTable(0), _updateRequest(-1), _tickLength(timerbase * 27), _ready(0), _reg(0), _rand(1), _outN(1),
 	_nTick(0), _evpUpdateCnt(0), _evpTimer(0x1f), _pReslt(0x1f), _attack(0), _cont(false), _evpUpdate(true),
 	_timer(0), _noiseGenerator(0), _chanEnable(0),
 	_volMaskA(0), _volMaskB(0), _volumeA(Audio::Mixer::kMaxMixerVolume), _volumeB(Audio::Mixer::kMaxMixerVolume) {
@@ -558,8 +561,8 @@ void TownsPC98_FmSynthSquareSineSource::nextTick(int32 *buffer, uint32 bufferSiz
 
 	for (uint32 i = 0; i < bufferSize; i++) {
 		_timer += _tickLength;
-		while (_timer > 0x5B8D80) {
-			_timer -= 0x5B8D80;
+		while (_timer > _rtt) {
+			_timer -= _rtt;
 
 			if (++_nTick >= (_noiseGenerator & 0x1f)) {
 				if ((_rand + 1) & 2)
@@ -597,7 +600,7 @@ void TownsPC98_FmSynthSquareSineSource::nextTick(int32 *buffer, uint32 bufferSiz
 
 		int32 finOut = 0;
 		for (int ii = 0; ii < 3; ii++) {
-int32 finOutTemp = ((_channels[ii].vol >> 4) & 1) ? _tleTable[_channels[ii].out ? _pReslt : 0] : _tlTable[_channels[ii].out ? (_channels[ii].vol & 0x0f) : 0];
+			int32 finOutTemp = ((_channels[ii].vol >> 4) & 1) ? _tleTable[_channels[ii].out ? _pReslt : 0] : _tlTable[_channels[ii].out ? (_channels[ii].vol & 0x0f) : 0];
 
 			if ((1 << ii) & _volMaskA)
 				finOutTemp = (finOutTemp * _volumeA) / Audio::Mixer::kMaxMixerVolume;
@@ -624,8 +627,8 @@ void TownsPC98_FmSynthSquareSineSource::updateRegs() {
 	_updateRequest = -1;
 }
 
-TownsPC98_FmSynthPercussionSource::TownsPC98_FmSynthPercussionSource(const uint32 timerbase) :
-	_tickLength(timerbase * 2), _timer(0), _ready(false), _volMaskA(0), _volMaskB(0), _volumeA(Audio::Mixer::kMaxMixerVolume), _volumeB(Audio::Mixer::kMaxMixerVolume) {
+TownsPC98_FmSynthPercussionSource::TownsPC98_FmSynthPercussionSource(const uint32 timerbase, const uint32 rtt) :
+	_rtt(rtt), _tickLength(timerbase * 2), _timer(0), _ready(false), _volMaskA(0), _volMaskB(0), _volumeA(Audio::Mixer::kMaxMixerVolume), _volumeB(Audio::Mixer::kMaxMixerVolume) {
 
 	memset(_rhChan, 0, sizeof(RhtChannel) * 6);
 	_reg = new uint8 *[40];
@@ -758,8 +761,8 @@ void TownsPC98_FmSynthPercussionSource::nextTick(int32 *buffer, uint32 bufferSiz
 
 	for (uint32 i = 0; i < bufferSize; i++) {
 		_timer += _tickLength;
-		while (_timer > 0x5B8D80) {
-			_timer -= 0x5B8D80;
+		while (_timer > _rtt) {
+			_timer -= _rtt;
 
 			for (int ii = 0; ii < 6; ii++) {
 				RhtChannel *s = &_rhChan[ii];
@@ -826,7 +829,7 @@ TownsPC98_FmSynth::TownsPC98_FmSynth(Audio::Mixer *mixer, EmuType type) :
 	_chanInternal(0), _ssg(0), _prc(0),
 	_numChan(type == kType26 ? 3 : 6), _numSSG(type == kTypeTowns ? 0 : 3), _hasPercussion(type == kType86 ? true : false),
 	_oprRates(0), _oprRateshift(0), _oprAttackDecay(0), _oprFrq(0), _oprSinTbl(0), _oprLevelOut(0), _oprDetune(0),
-	_baserate(55125.0f / (float)mixer->getOutputRate()),
+	 _rtt(type == kTypeTowns ? 0x514767 : 0x5B8D80), _baserate(55125.0f / (float)mixer->getOutputRate()),
 	_volMaskA(0), _volMaskB(0), _volumeA(255), _volumeB(255),
 	_regProtectionFlag(false), _ready(false) {
 
@@ -834,7 +837,7 @@ TownsPC98_FmSynth::TownsPC98_FmSynth(Audio::Mixer *mixer, EmuType type) :
 	memset(&_timers[1], 0, sizeof(ChipTimer));
 	_timers[0].cb = &TownsPC98_FmSynth::timerCallbackA;
 	_timers[1].cb = &TownsPC98_FmSynth::timerCallbackB;
-	_timerbase = (uint32)(_baserate * 1000000.0f);
+	_timerbase = (uint32)(_baserate * 1000000.0f);	
 }
 
 TownsPC98_FmSynth::~TownsPC98_FmSynth() {
@@ -865,16 +868,16 @@ bool TownsPC98_FmSynth::init() {
 	for (int i = 0; i < _numChan; i++) {
 		memset(&_chanInternal[i], 0, sizeof(ChanInternal));
 		for (int j = 0; j < 4; ++j)
-			_chanInternal[i].opr[j] = new TownsPC98_FmSynthOperator(_timerbase, _oprRates, _oprRateshift, _oprAttackDecay, _oprFrq, _oprSinTbl, _oprLevelOut, _oprDetune);
+			_chanInternal[i].opr[j] = new TownsPC98_FmSynthOperator(_timerbase, _rtt, _oprRates, _oprRateshift, _oprAttackDecay, _oprFrq, _oprSinTbl, _oprLevelOut, _oprDetune);
 	}
 
 	if (_numSSG) {
-		_ssg = new TownsPC98_FmSynthSquareSineSource(_timerbase);
+		_ssg = new TownsPC98_FmSynthSquareSineSource(_timerbase, _rtt);
 		_ssg->init(&_ssgTables[0], &_ssgTables[16]);
 	}
 
 	if (_hasPercussion) {
-		_prc = new TownsPC98_FmSynthPercussionSource(_timerbase);
+		_prc = new TownsPC98_FmSynthPercussionSource(_timerbase, _rtt);
 		_prc->init(_percussionData);
 	}
 
diff --git a/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.h b/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.h
index 34ee2ce7b8..3072503610 100644
--- a/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.h
+++ b/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.h
@@ -160,6 +160,7 @@ private:
 
 	const float _baserate;
 	uint32 _timerbase;
+	uint32 _rtt;
 
 	Audio::Mixer *_mixer;
 	Audio::SoundHandle _soundHandle;