Well my friend & I both jumped into a multiplayer game which we both had sound at the menu, but once the game loaded to the action there was no sound at all. However after the round was over & we were back at the menu we both had sound. Is this a bug or due to maybe the server it self. Also game ran kinda choppy too using xfire cards.

Try the games settings as this is what worked for me but I never heard any in game chating between team mates.

I forgot the name of the map, once i get back on it I will note what map it was cause the other maps the audio was fine but when back on the same map again it had no audio. So I'll be sure to note which one it was.