Okay, so I've been trying to record my guitar using a regular 1/4" instrument cable and a 1/4" to 1/8" adaptor into the line-in of my Blackbook. I go to System Preferences so the app uses the line-in and not the build-in mic. Under "details", it is set to record in stereo. It records fine and sounds good, but when I put on my headphones, the tracks I recorded only come out of one ear. The software tracks are fine (as are the tracks I've recorded via the built-in mic and a USB mic). Well, this really puts a hamper on the song...any ideas why this is happening? Is it just because regular Macbooks don't come with a very good sound card?