diff --git a/source/mididevices/music_fluidsynth_mididevice.cpp b/source/mididevices/music_fluidsynth_mididevice.cpp
index ae3e7d1..1a33d3c 100644
--- a/source/mididevices/music_fluidsynth_mididevice.cpp
+++ b/source/mididevices/music_fluidsynth_mididevice.cpp
@@ -239,9 +239,10 @@ void FluidSynthMIDIDevice::HandleEvent(int status, int parm1, int parm2)
 
 void FluidSynthMIDIDevice::HandleLongEvent(const uint8_t *data, int len)
 {
-	if (len > 1 && (data[0] == 0xF0 || data[0] == 0xF7))
+	constexpr int excludedByteCount = 2;						// 0xF0 (first byte) and 0xF7 (last byte) are not given to FluidSynth.
+	if (len > excludedByteCount && data[0] == 0xF0 && data[len - 1] == 0xF7)
 	{
-		fluid_synth_sysex(FluidSynth, (const char *)data + 1, len - 1, NULL, NULL, NULL, 0);
+		fluid_synth_sysex(FluidSynth, (const char *)data + 1, len - excludedByteCount, NULL, NULL, NULL, 0);
 	}
 }
 
diff --git a/source/musicformats/music_midi.cpp b/source/musicformats/music_midi.cpp
index eb43daf..9dda9f4 100644
--- a/source/musicformats/music_midi.cpp
+++ b/source/musicformats/music_midi.cpp
@@ -815,7 +815,7 @@ int MIDIStreamer::FillBuffer(int buffer_num, int max_events, uint32_t max_time)
 	if (InitialPlayback)
 	{
 		InitialPlayback = false;
-		// Send the GS System Reset SysEx message.
+		// Send the GM System Enable SysEx message.
 		events[0] = 0;								// dwDeltaTime
 		events[1] = 0;								// dwStreamID
 		events[2] = (MEVENT_LONGMSG << 24) | 6;		// dwEvent
@@ -823,6 +823,15 @@ int MIDIStreamer::FillBuffer(int buffer_num, int max_events, uint32_t max_time)
 		events[4] = MAKE_ID(0x01, 0xf7, 0x00, 0x00);	// dwParms[1]
 		events += 5;
 
+		// Send the GS DT1 MODE SET GS Reset SysEx message.
+		events[0] = 0;									// dwDeltaTime
+		events[1] = 0;									// dwStreamID
+		events[2] = (MEVENT_LONGMSG << 24) | 11;		// dwEvent
+		events[3] = MAKE_ID(0xf0, 0x41, 0x7f, 0x42);	// dwParms[0]
+		events[4] = MAKE_ID(0x12, 0x40, 0x00, 0x7f);	// dwParms[1]
+		events[5] = MAKE_ID(0x00, 0x41, 0xf7, 0x00);	// dwParms[2]
+		events += 6;
+
 		// Send the full master volume SysEx message.
 		events[0] = 0;								// dwDeltaTime
 		events[1] = 0;								// dwStreamID