I've had a Roland XP-30 and just got the M-Audio MidiSport Uno and downloaded the latest drivers from the site. The device is recognized on my Powerbook, but I can't get any audio playback from the keyboard. I've tried messing with settings on the keyboard, but still can't get it to play or record on my Powerbook. In GarageBand, Reason, and Audio MIDI Setup the device is properly recognized. I'm not sure what's wrong. Can anyone please help?