Ok i just got xbox live for the 360 and i playing halo 3 with the headset but it says it muted i tried to un mute it but it says u muted this player in the xbox guide so i went to preferences and everything was ok and it was still muted so i pressed pause and went to voices setting or whatever it is and it says Not Muted (Default) and it is still muted. what do i do?????