Col? Dat you!?! Wow! Good ta see sneakin over to the dark side....well kinda...seein as how you're still using an Apple.
Welcome!!!
Did you go into the game, then hit esc (brings up map), options then preferences. In there try hitting "use wave in" and check volume levels.
Also, you can hear your own voice in the game, as a test, simple by hitting you / key then typing in your call sign in the far right radio (its radio V). Once done hit your T key and talk. Whatever level you are hearing is what everyone else hears.
Also, have you checked your mic level volumes in windoz? I think it's start/accessories/entertainment/recorder or mic recorder. Make sure you set volumes up in there. Remember you don't have to be able to hear your own voice in your headset.
I'll be in the MA tonight. Feel free to get me and let's see if we can work it out. If need be we can go over to the training area (TA) and spend a few minutes sorting it out.