I bought an Evolution MK-249C a few days ago and for the life of me couldn’t get it working on my MacBook Pro with Logic or GarageBand. Apparently this is a Panther and Snow Leopard issue. It would show as a USB driver in System Profiler but wouldn’t show up as a MIDI device in either software. I googled and googled and couldn’t find anything. Finally, I found this thread on the M-Audio site with a solution. I’ve saved these two files on my site in case they ever disappear!