So I have GarageBand, a USB keyboard, a MobilePre USB, and a guitar. I open up garageband, the USB keyboard works great with it. Then I try to use my MobilePre as an audio interface with my guitar... It doesnt work. So I check the preferences and make sure the inputs are set to the mobilepre etc... They are. Still doesnt work. I try using the MobilePre with the guitar to record into another application (AudioX) it works... But I still cant get GarageBand to get a signal from the guitar. Please help!