Hmm... well if you're gonna be using your vocal chords, I might as well put that headset that came with the game to good use (it has terrible bass though).
Sorry, when I said "chatterbox", i meant "text chatterbox".
I have a mix and headphone set up, but there seems to be some kind of conflict between the game and my soundcard which a lot of other people have had problems with. I can hear myself speaking, I can order bots around in single player, when online, you can see the volume metre peaking on the left of the screen...but nobody can hear me.
I eventually gave up and now I just stick to text binds.