This is really weird, and I've never seen anyone have this problem. When I play a CD in my Macbook Pro that has stereo separation panned hard Left and Right, the instrument that should only be in the left channel is in the right as well (but to a lesser degree) the reverse is true for any instrument panned hard right. When I play the same CD on my CD player these signals are not in any way crossing over to the other channel. I have already check the UNVIVERSAL ACCESS panel and have unchecked the "PLAY STEREO AUDIO as MONO" option. This problem is important because PLAY ALONG CD's for musicians are mixed so that if you turn the stereo playback hard right you shouldn't hear the piano track (hearing only the bass and drums in the left channel, and if you turn the playback hard left you lose the bass, (hearing only the piano and drums). If you're pianist, you practice with the piano track missing of course. if you're a bass player you practice with the bass track missing. Needless to say, files imported into itunes have this mixed up stereo leakage problem. Any one have a solution?