Hi. I just bought a Razer Carcharias headset, but I'm having problems. First, the mic doesn't seem to work. I have it plugged into the line-in port on my iMac (Intel Core i5 with Snow Leopard, bought in July). I've done some searches online and apparently I need some kind of adapter. I was hoping someone could confirm this for me. I've seen a few posts that seem to imply maybe I shouldn't need one, and I hate to spend an extra $30 if I don't need to. Second, when I play music it sounds absolutely awful. The vocals are so quiet I can hardly hear them, the bass is muffled, and the high tones cause these piercing screeches and beeping noises. Any idea what's up with that?