6 files changed, 7 insertions, 1 deletions
diff --git a/backends/midi/coreaudio.cpp b/backends/midi/coreaudio.cpp
index 47561f4f96..65f0e0274f 100644
--- a/backends/midi/coreaudio.cpp
+++ b/backends/midi/coreaudio.cpp
@@ -90,6 +90,8 @@ int MidiDriver_CORE::open() {
 }
 
 void MidiDriver_CORE::close() {
+	MidiDriver_MPU401::close();
+
 	// Stop the output
 	AudioOutputUnitStop(au_output);
 
diff --git a/backends/midi/morphos.cpp b/backends/midi/morphos.cpp
index b4f5fd4eff..20dd409fca 100644
--- a/backends/midi/morphos.cpp
+++ b/backends/midi/morphos.cpp
@@ -68,6 +68,7 @@ int MidiDriver_ETUDE::open()
 
 void MidiDriver_ETUDE::close()
 {
+	MidiDriver_MPU401::close();
 	exit_morphos_music();
 	_isOpen = false;
 }
diff --git a/backends/midi/null.cpp b/backends/midi/null.cpp
index 062bcea31c..9366bc7f1c 100644
--- a/backends/midi/null.cpp
+++ b/backends/midi/null.cpp
@@ -26,7 +26,6 @@
 class MidiDriver_NULL : public MidiDriver_MPU401 {
 public:
 	int open();
-	void close() { }
 	void send(uint32 b) { }
 };
 
diff --git a/backends/midi/quicktime.cpp b/backends/midi/quicktime.cpp
index e61e6409f2..928705ba71 100644
--- a/backends/midi/quicktime.cpp
+++ b/backends/midi/quicktime.cpp
@@ -115,6 +115,8 @@ bail:
 
 void MidiDriver_QT::close()
 {
+	MidiDriver_MPU401::close();
+
 	for (int i = 0; i < 15; i++) {
 		if (qtNoteChannel[i] != NULL)
 			NADisposeNoteChannel(qtNoteAllocator, qtNoteChannel[i]);
diff --git a/backends/midi/seq.cpp b/backends/midi/seq.cpp
index fc7777ece2..2fab845887 100644
--- a/backends/midi/seq.cpp
+++ b/backends/midi/seq.cpp
@@ -87,6 +87,7 @@ int MidiDriver_SEQ::open() {
 }
 
 void MidiDriver_SEQ::close() {
+	MidiDriver_MPU401::close();
 	::close(device);
 	_isOpen = false;
 }
diff --git a/backends/midi/windows.cpp b/backends/midi/windows.cpp
index c4ebcfd9ce..319997d6c5 100644
--- a/backends/midi/windows.cpp
+++ b/backends/midi/windows.cpp
@@ -68,6 +68,7 @@ void MidiDriver_WIN::close() {
 	if (!_isOpen)
 		return;
 	_isOpen = false;
+	MidiDriver_MPU401::close();
 	midiOutUnprepareHeader (_mo, &_streamHeader, sizeof (_streamHeader));
 	check_error(midiOutClose(_mo));
 	CloseHandle (_streamEvent);