I am trying to voice chat in COD4 Modern Warfare but not having any success. I've tried several mics: the internal, one that plugs into the headphone jack and one USB. All work in System Prefs, all work when testing them in the Steam program. Once I try in the actual game no one can hear me. In fact, no one can see my chat icon either while I can. Just wondering if anyone has experienced this or has any insight!