diff --git a/headers/private/midi/debug.h b/headers/private/midi/debug.h
new file mode 100644
index 0000000000..b606a6d405
--- /dev/null
+++ b/headers/private/midi/debug.h
@@ -0,0 +1,20 @@
+
+#ifndef MIDI_DEBUG_H
+#define MIDI_DEBUG_H
+
+#include <stdio.h>
+
+#ifndef NDEBUG
+
+#define TRACE(args)    { printf args; } 
+#define UNIMPLEMENTED  TRACE(("[midi] UNIMPLEMENTED %s\n",__PRETTY_FUNCTION__))
+
+#else
+
+#define TRACE(args)
+#define UNIMPLEMENTED
+
+#endif
+
+#endif // MIDI_DEBUG_H
+