6 files changed, 12 insertions, 12 deletions
diff --git a/backends/midi/alsa.cpp b/backends/midi/alsa.cpp
index 406e52243b..5a109148a4 100644
--- a/backends/midi/alsa.cpp
+++ b/backends/midi/alsa.cpp
@@ -61,7 +61,7 @@ public:
 	int open();
 	void close();
 	void send(uint32 b);
-	void sysEx(byte *msg, uint16 length);
+	void sysEx(const byte *msg, uint16 length);
 
 private:
 	void send_event(int do_flush);
@@ -192,7 +192,7 @@ void MidiDriver_ALSA::send(uint32 b) {
 	}
 }
 
-void MidiDriver_ALSA::sysEx(byte *msg, uint16 length) {
+void MidiDriver_ALSA::sysEx(const byte *msg, uint16 length) {
 	unsigned char buf[1024];
 
 	if (length > 254) {
diff --git a/backends/midi/coreaudio.cpp b/backends/midi/coreaudio.cpp
index b6c4c0c9da..81b72387dd 100644
--- a/backends/midi/coreaudio.cpp
+++ b/backends/midi/coreaudio.cpp
@@ -56,7 +56,7 @@ public:
 	int open();
 	void close();
 	void send(uint32 b);
-	void sysEx(byte *msg, uint16 length);
+	void sysEx(const byte *msg, uint16 length);
 
 private:
 	AUGraph _auGraph;
@@ -177,7 +177,7 @@ void MidiDriver_CORE::send(uint32 b) {
 	MusicDeviceMIDIEvent(_synth, status_byte, first_byte, second_byte, 0);
 }
 
-void MidiDriver_CORE::sysEx(byte *msg, uint16 length) {
+void MidiDriver_CORE::sysEx(const byte *msg, uint16 length) {
 	assert(_auGraph != NULL);
 
 	// Add SysEx frame if missing
diff --git a/backends/midi/coremidi.cpp b/backends/midi/coremidi.cpp
index 598aaaba3f..d92f775a2d 100644
--- a/backends/midi/coremidi.cpp
+++ b/backends/midi/coremidi.cpp
@@ -50,7 +50,7 @@ public:
 	int open();
 	void close();
 	void send(uint32 b);
-	void sysEx(byte *msg, uint16 length);
+	void sysEx(const byte *msg, uint16 length);
 
 private:
 	MIDIClientRef	mClient;
@@ -149,7 +149,7 @@ void MidiDriver_CoreMIDI::send(uint32 b) {
 	MIDISend(mOutPort, mDest, &packetList);
 }
 
-void MidiDriver_CoreMIDI::sysEx(byte *msg, uint16 length) {
+void MidiDriver_CoreMIDI::sysEx(const byte *msg, uint16 length) {
 	assert(mOutPort != NULL);
 	assert(mDest != NULL);
 
diff --git a/backends/midi/seq.cpp b/backends/midi/seq.cpp
index 9a0bf6b837..0a1458afd4 100644
--- a/backends/midi/seq.cpp
+++ b/backends/midi/seq.cpp
@@ -46,7 +46,7 @@ public:
 	int open();
 	void close();
 	void send(uint32 b);
-	void sysEx(byte *msg, uint16 length);
+	void sysEx(const byte *msg, uint16 length);
 
 private:
 	bool _isOpen;
@@ -140,7 +140,7 @@ void MidiDriver_SEQ::send(uint32 b) {
 	write(device, buf, position);
 }
 
-void MidiDriver_SEQ::sysEx (byte *msg, uint16 length) {
+void MidiDriver_SEQ::sysEx (const byte *msg, uint16 length) {
 	if (length > 254) {
 		warning ("Cannot send SysEx block - data too large");
 		return;
diff --git a/backends/midi/windows.cpp b/backends/midi/windows.cpp
index 2164f2a0c5..f03716f0eb 100644
--- a/backends/midi/windows.cpp
+++ b/backends/midi/windows.cpp
@@ -46,7 +46,7 @@ public:
 	int open();
 	void close();
 	void send(uint32 b);
-	void sysEx (byte *msg, uint16 length);
+	void sysEx (const byte *msg, uint16 length);
 };
 
 int MidiDriver_WIN::open() {
@@ -89,7 +89,7 @@ void MidiDriver_WIN::send(uint32 b) {
 	check_error(midiOutShortMsg(_mo, u.dwData));
 }
 
-void MidiDriver_WIN::sysEx(byte *msg, uint16 length) {
+void MidiDriver_WIN::sysEx(const byte *msg, uint16 length) {
 	if (!_isOpen)
 		return;
 
diff --git a/backends/midi/zodiac.cpp b/backends/midi/zodiac.cpp
index 3ad4d88e50..1aa65139b5 100644
--- a/backends/midi/zodiac.cpp
+++ b/backends/midi/zodiac.cpp
@@ -35,7 +35,7 @@ public:
 	int open();
 	void close();
 	void send(uint32 b);
-	void sysEx(byte *msg, uint16 length);
+	void sysEx(const byte *msg, uint16 length);
 
 private:
 	TwMidiHandle _midiHandle;
@@ -109,7 +109,7 @@ void MidiDriver_Zodiac::send(uint32 b) {
 	}
 }
 
-void MidiDriver_Zodiac::sysEx(byte *msg, uint16 length) {
+void MidiDriver_Zodiac::sysEx(const byte *msg, uint16 length) {
 	TwMidiSysEx(_midiHandle, 0, msg, length);
 }