This is partially out of curiosity, and partly, potentially, useful.

The gist of what I'm looking for is an application (preferably OSX, though it wouldn't be a deal breaker to be Windows or *nix, and preferably free) that would capture MIDI controller data as it entered the computer, whether that be SysEx, channel, system, controller, note on/off, pots, you name it. All of it.

I'm not terribly concerned with the format that the data would be presented. I'm sure it would be interesting however it was presented. I picture, basically, a window that fills up with text (midi data) as I send data through. My guess would be that it parsed out whatever OSX's core Midi software saw.

I am not interested in a large piece of software that "also does MIDI", or has some extra small feature amongst the DAW backdrop. Looking for a small footprint.

tl;dr, The last time I had all of my gear set up, my keyboard controller (an Alesis Q25) kept throwing pitch bend data on its own. I was sure that the data stopped when the controller was unplugged, but I had no way of pinning down exactly what was going on. I eventually gave up.

3 Answers 3


I think MIDIMonitor will do what you want.

  • Yep, I think that's exactly what I want :)
    – JoshP
    Commented Oct 10, 2012 at 11:43
  • 1
    Thank you so much! I've been looking for this also. That's the great thing about the SE network, even after OP has his/her answer, there is useful information for future users.
    – DJMcMayhem
    Commented Feb 22, 2015 at 21:46

A Windows alternative would be MIDI-OX. Solid stuff.



Pure Data is an extremely powerful piece of freeware designed and coded by the creator of MAX/MSP.

I've used it a number of times to create powerful midi controlled synthesizers which you can build and fully customize yourself.

  • I was about to recommend PD myself, but the asker specifically indicated that he didn't want a larger system that "also does MIDI". Commented Oct 11, 2012 at 18:04
  • I appreciate that, but keep in mind with Pd you're free to build a patch with only a functionality you want :)
    – Jazibobs
    Commented Oct 12, 2012 at 10:49

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