Explicitly tell RTMIDI to not ignore any midi in message types.

src/sound/midi_rtmidi.cpp

@@ -183,7 +183,10 @@ rtmidi_input_init(const device_t *info)
 	}
     }
 
-    midiin->setCallback(rtmidi_input_callback);
+    midiin->setCallback(&rtmidi_input_callback);
+
+    // Don't ignore sysex, timing, or active sensing messages.
+    midiin->ignoreTypes(false, false, false);
 
     midi_in_init(dev, &midi_in);