I have hooked up a Tascam us-122 to my IMac and have done all the I/O configurations. I am using Garageband2. When I create a real instrument track, I don't see anything on the track meters when I play, and the track dosen't have a record enable button. The direct out of the us-122 works fine. (the us-122 is a usb device) Whats Up?