4 files changed, 10 insertions, 10 deletions
diff --git a/engines/scumm/imuse/imuse_internal.h b/engines/scumm/imuse/imuse_internal.h
index 3640cafa64..45e1b89a4a 100644
--- a/engines/scumm/imuse/imuse_internal.h
+++ b/engines/scumm/imuse/imuse_internal.h
@@ -265,7 +265,7 @@ public:
 	void close() { }
 	void send(uint32 b);
 	const char *getErrorName(int error_code) { return "Unknown"; }
-	void sysEx(byte *msg, uint16 length);
+	void sysEx(const byte *msg, uint16 length);
 	void metaEvent(byte type, byte *data, uint16 length);
 	void setTimerCallback(void *timer_param, void(*timer_proc)(void *)) { }
 	uint32 getBaseTempo();
diff --git a/engines/scumm/imuse/imuse_player.cpp b/engines/scumm/imuse/imuse_player.cpp
index b73eb2a3bf..540be1a2f9 100644
--- a/engines/scumm/imuse/imuse_player.cpp
+++ b/engines/scumm/imuse/imuse_player.cpp
@@ -343,7 +343,7 @@ void Player::send(uint32 b) {
 	return;
 }
 
-void Player::sysEx(byte *p, uint16 len) {
+void Player::sysEx(const byte *p, uint16 len) {
 	byte code;
 	byte a;
 	uint b;
diff --git a/engines/scumm/imuse/instrument.cpp b/engines/scumm/imuse/instrument.cpp
index 16d89c5ed2..4af3ef096b 100644
--- a/engines/scumm/imuse/instrument.cpp
+++ b/engines/scumm/imuse/instrument.cpp
@@ -164,7 +164,7 @@ private:
 	} _instrument;
 
 public:
-	Instrument_Adlib (byte *data);
+	Instrument_Adlib (const byte *data);
 	Instrument_Adlib (Serializer *s);
 	void saveOrLoad (Serializer *s);
 	void send (MidiChannel *mc);
@@ -239,7 +239,7 @@ private:
 	uint8 getEquivalentGM();
 
 public:
-	Instrument_Roland (byte *data);
+	Instrument_Roland (const byte *data);
 	Instrument_Roland (Serializer *s);
 	void saveOrLoad (Serializer *s);
 	void send (MidiChannel *mc);
@@ -272,7 +272,7 @@ void Instrument::program (byte prog, bool mt32) {
 	_instrument = new Instrument_Program (prog, mt32);
 }
 
-void Instrument::adlib (byte *instrument) {
+void Instrument::adlib (const byte *instrument) {
 	clear();
 	if (!instrument)
 		return;
@@ -280,7 +280,7 @@ void Instrument::adlib (byte *instrument) {
 	_instrument = new Instrument_Adlib (instrument);
 }
 
-void Instrument::roland (byte *instrument) {
+void Instrument::roland (const byte *instrument) {
 	clear();
 	if (!instrument)
 		return;
@@ -361,7 +361,7 @@ void Instrument_Program::send (MidiChannel *mc) {
 //
 ////////////////////////////////////////
 
-Instrument_Adlib::Instrument_Adlib (byte *data) {
+Instrument_Adlib::Instrument_Adlib (const byte *data) {
 	memcpy (&_instrument, data, sizeof (_instrument));
 }
 
@@ -389,7 +389,7 @@ void Instrument_Adlib::send (MidiChannel *mc) {
 //
 ////////////////////////////////////////
 
-Instrument_Roland::Instrument_Roland (byte *data) {
+Instrument_Roland::Instrument_Roland (const byte *data) {
 	memcpy (&_instrument, data, sizeof (_instrument));
 	memcpy (&_instrument_name, &_instrument.common.name, sizeof (_instrument.common.name));
 	_instrument_name[10] = '\0';
diff --git a/engines/scumm/imuse/instrument.h b/engines/scumm/imuse/instrument.h
index eb1a30a1d1..49d8b00880 100644
--- a/engines/scumm/imuse/instrument.h
+++ b/engines/scumm/imuse/instrument.h
@@ -65,8 +65,8 @@ public:
 	void copy_to (Instrument *dest) { if (_instrument) _instrument->copy_to (dest); else dest->clear(); }
 
 	void program (byte program, bool mt32);
-	void adlib (byte *instrument);
-	void roland (byte *instrument);
+	void adlib (const byte *instrument);
+	void roland (const byte *instrument);
 
 	byte getType() { return _type; }
 	bool isValid() { return (_instrument ? _instrument->is_valid() : false); }