I recorded a single track on GarageBand, and I can only get the audio to come out of the left speaker. There is no sound of any kind coming out of the right speaker. If I pan the track all the way to the right, no sound comes out at all. I've tried duplicating the track and panning one all the way to the left, and then panning another all the way to the right, but I've had no luck with this either. Any suggestions?