3 files changed, 13 insertions, 13 deletions
diff --git a/sound/softsynth/adlib.cpp b/sound/softsynth/adlib.cpp
index 84cb7d3c7e..4c584eb4d6 100644
--- a/sound/softsynth/adlib.cpp
+++ b/sound/softsynth/adlib.cpp
@@ -124,7 +124,7 @@ public:
 	void allNotesOff();
 
 	// SysEx messages
-	void sysEx_customInstrument(uint32 type, byte *instr);
+	void sysEx_customInstrument(uint32 type, const byte *instr);
 };
 
 // FYI (Jamieson630)
@@ -153,7 +153,7 @@ public:
 	void sustain(bool value) { }
 
 	// SysEx messages
-	void sysEx_customInstrument(uint32 type, byte *instr) { }
+	void sysEx_customInstrument(uint32 type, const byte *instr) { }
 };
 
 struct Struct10 {
@@ -553,7 +553,7 @@ public:
 	uint32 property(int prop, uint32 param);
 
 	void setPitchBendRange(byte channel, uint range);
-	void sysEx_customInstrument(byte channel, uint32 type, byte *instr);
+	void sysEx_customInstrument(byte channel, uint32 type, const byte *instr);
 
 	MidiChannel *allocateChannel();
 	MidiChannel *getPercussionChannel() { return &_percussion; } // Percussion partially supported
@@ -758,7 +758,7 @@ void AdlibPart::allNotesOff() {
 		_owner->mc_off(_voice);
 }
 
-void AdlibPart::sysEx_customInstrument(uint32 type, byte *instr) {
+void AdlibPart::sysEx_customInstrument(uint32 type, const byte *instr) {
 	if (type == 'ADL ') {
 		AdlibInstrument *i = &_part_instr;
 		memcpy(i, instr, sizeof(AdlibInstrument));
@@ -945,7 +945,7 @@ void MidiDriver_ADLIB::setPitchBendRange(byte channel, uint range) {
 	}
 }
 
-void MidiDriver_ADLIB::sysEx_customInstrument(byte channel, uint32 type, byte *instr) {
+void MidiDriver_ADLIB::sysEx_customInstrument(byte channel, uint32 type, const byte *instr) {
 	_parts[channel].sysEx_customInstrument(type, instr);
 }
 
diff --git a/sound/softsynth/mt32.cpp b/sound/softsynth/mt32.cpp
index 0e840b2b44..0b3b6dffe3 100644
--- a/sound/softsynth/mt32.cpp
+++ b/sound/softsynth/mt32.cpp
@@ -64,7 +64,7 @@ public:
 	void close();
 	void send(uint32 b);
 	void setPitchBendRange (byte channel, uint range);
-	void sysEx(byte *msg, uint16 length);
+	void sysEx(const byte *msg, uint16 length);
 
 	uint32 property(int prop, uint32 param);
 	MidiChannel *allocateChannel();
@@ -305,7 +305,7 @@ void MidiDriver_MT32::setPitchBendRange(byte channel, uint range) {
 	sysEx(benderRangeSysex, 9);
 }
 
-void MidiDriver_MT32::sysEx(byte *msg, uint16 length) {
+void MidiDriver_MT32::sysEx(const byte *msg, uint16 length) {
 	if (msg[0] == 0xf0) {
 		_synth->playSysex(msg, length);
 	} else {
@@ -398,7 +398,7 @@ private:
 
 protected:
 	void send(uint32 b);
-	void sysEx(byte *msg, uint16 length);
+	void sysEx(const byte *msg, uint16 length);
 
 public:
 	MidiDriver_ThreadedMT32(Audio::Mixer *mixer);
@@ -457,7 +457,7 @@ void MidiDriver_ThreadedMT32::send(uint32 b) {
 	pushMidiEvent(event);
 }
 
-void MidiDriver_ThreadedMT32::sysEx(byte *msg, uint16 length) {
+void MidiDriver_ThreadedMT32::sysEx(const byte *msg, uint16 length) {
 	MidiEvent_MT32 *event = new MidiEvent_MT32(0xFFFFFFFF, msg, length);
 	pushMidiEvent(event);
 }
diff --git a/sound/softsynth/ym2612.cpp b/sound/softsynth/ym2612.cpp
index ae50e3011e..49f63abd63 100644
--- a/sound/softsynth/ym2612.cpp
+++ b/sound/softsynth/ym2612.cpp
@@ -150,7 +150,7 @@ public:
 	void pitchBend(int16 value);
 	void controlChange(byte control, byte value);
 	void pitchBendFactor(byte value) { }
-	void sysEx_customInstrument(uint32 type, byte *instr);
+	void sysEx_customInstrument(uint32 type, const byte *instr);
 };
 
 class MidiDriver_YM2612 : public MidiDriver_Emulated {
@@ -179,7 +179,7 @@ public:
 	uint32 property(int prop, uint32 param) { return 0; }
 
 	void setPitchBendRange(byte channel, uint range) { }
-	void sysEx(byte *msg, uint16 length);
+	void sysEx(const byte *msg, uint16 length);
 
 	MidiChannel *allocateChannel() { return 0; }
 	MidiChannel *getPercussionChannel() { return 0; }
@@ -675,7 +675,7 @@ void MidiChannel_YM2612::controlChange(byte control, byte value) {
 	}
 }
 
-void MidiChannel_YM2612::sysEx_customInstrument(uint32 type, byte *fmInst) {
+void MidiChannel_YM2612::sysEx_customInstrument(uint32 type, const byte *fmInst) {
 	if (type != 'EUP ')
 		return;
 	Voice2612 *voice = new Voice2612;
@@ -798,7 +798,7 @@ void MidiDriver_YM2612::send(byte chan, uint32 b) {
 	}
 }
 
-void MidiDriver_YM2612::sysEx(byte *msg, uint16 length) {
+void MidiDriver_YM2612::sysEx(const byte *msg, uint16 length) {
 	if (msg[0] != 0x7C || msg[1] >= ARRAYSIZE(_channel))
 		return;
 	_channel[msg[1]]->sysEx_customInstrument('EUP ', &msg[2]);