I upgraded to the Axiom, and don't need this anymore. Works great with Reaper, and requires no drivers/software under OSX. Just plug in the USB, map your MIDI and go to town.
[VIDEO]http://www.amazon.com/M-Audio-Oxygen-25-25-Key-Controller/dp/B002VYJDYW/ref=sr_1_1?s=musical-instruments&ie=UTF8&qid=1311459337&sr=1-1]Amazon.com: M-Audio Oxygen 25 25-Key USB MIDI Controller: Musical Instruments[/VIDEO]
$75 shipped as well. It's mint, and I have the original box.
I have one of these. Great little unit. So what are you controlling your midi with now?
Edit: I guess that new axiom you made a thread for