I am a professional voice over guy. Occasionally I will record stuff for projects friends are working on and in order to do this I got about the most basic set-up imaginable. M-Audio mbox and a Shure SM58. I realize I'm not blowing any minds with that. Professionally I record in amazing studios with the best equipment, but this set-up suits my needs fine. I used to record in garageband on an old eMac and the sound quality was fine for my purposes. When I switched this fall to one of the new macbooks, the sound changed dramatically. Suddenly my voice sounds tinnier and slightly distant. I lost all the upfront, standing right beside you feel that I was getting with the old set-up. All the equipment and settings have been the same. The only difference was switching computers and changing to a much newer version of garageband. Is the newer version better somehow? With better drivers or something, so my weak equipment is showing its true colors? I really have no clue what's going on. Ideas?