MidiTest is a simple utility (made with Max) allowing to test midi interfaces inputs. It shows midi messages like NoteOn, AfterTouch, PitchBend, ProgramChanges, Controllers and SystemExclusives. OMS is needed.
This application is written in French, but itis simple enough to be easily understood.
Changes History: Version 1.3 improves the MIDI thru function.
MidiTest is available for free and you can find more information about it at MacMusic.org.