My new iMac has a slight defect... it's Optical Out port is a little geared towards the right stereo channel being louder than the left. It's kind of annoying when listening to music. Is there a way I can fix, diagnose, or fiddle with the balance of my Mac's sounds? I figure if I tune it a bit to the left, it should fix the problem... I don't think I should return a new iMac and go through the process of reinstalling everything for such a small problem.