Hey, I just got my new macbook with garageband and Im all ready to start recording. Im poor, so how Ive always recorded before with my previous PC was to plug my amp or keyboard directly into the line-in with a 1/8″ adapter. Ive never had problems until now with my macbook. I was able to get it all working and even recorded 2 guitar tracks, and when I was going to attempt a third, there was only a consistent thumping coming through. Ive tried and checked everything I can think of but now whether Garageband is open or closed all that the computer gets from plugging my adapter in is that consistent frequency with no sound at all from my guitar. I would just figure that the computer has rejected my method or equipment But it worked twice! Whats going on?!!! Anyone have any ideas, or faced a similar situation? I really want to get started with this awesome program!