hey folks,
this made me crazy last night, and I found the answer this morning on the Apple discussions. GarageBand doesn't simply work out of the gate with any digidesign hardware (or any MOTU hardware, as I understand it, tho I don't have an answer for those folks).
Even though you think you're fine in the sound system preference, and the device even appears to be working with the app, GarageBand's prefs still don't mention your digidesign hardware as either an output or input option.
That is, until you do this: You need to explicitly add GarageBand to the Digidesign supported apps list using the Digidesign CoreAudio Setup app (/Applications/Digidesign/Digidesign CoreAudio Setup.app).
Once you do that, reload GarageBand, go to its audio/midi prefs, and now your digidesign hardware is an option for input and output. At this point, I officially license you to rock!
