Update! I've found that when I disable "Radio Assists" in the gameplay menue, I no longer have the problem. Also, however, with "Radio Assists" disabled, you don't have the missle markers either..lol. What the markers have to do with "Radio Assists" I don't know. I've found a work around for that too. Enable "labels" in the gameplay menue, and when entering a mission, push Lshift + F-6, and the incoming, (and outgoing for that matter), missiles will have text labels on them. At that point, the audio problem is solved, and missiles are labeled. The only difference is that there will be no "Betty" calling out the missiles, and the direction they are coming from. I can live with that! :)