Since Apple decided to save an audio input for entry level laptops until they had a pentium chip to go with it, I have no way to record live instruments on my ibook other than buying an external device, or using the built in mic. Since all I want to do is record some musical sketches on acoustic guitar, I think the built in mic will be adequate. However, I can't find any option for using it in GarageBand. I also tried using the Note Recorder function in MS Word. It worked at first, but then about 20 seconds in to the track, it started to cut out and distort. Any solutions would be very welcome!