Ok, I have a powerbook G4 with osx 10.4.11 and I've recorded in GB for almost 2 years now by simply lining my guitar and piano straight in, which has worked fine. Vocals however have been done through the built-in mic with less than perfect results (as you can imagine). So I recently bought an m-audio fast track USB and I can't get it to work. I've changed all the preferences in both garageband and system preferences and I can see my guitar signal on the "audio in" tab in sys.pref. but I still don't get a signal into GB. What's wrong?