Just Encountered this Problem today when I try to install Crossfire again, Downloaded the "Full Client Download" after finished downloading the it and launched the game so far There was no problem with any audio BGM Settings turned on by Default at 100 Volume same goes for Effect Sound Settings and Radio Sound Settings. Tried to play Destruction Mode and was faced with this problem there was no audio ( Gunfire, Foot Steps, and when Switching) also tried in every mode still the same and decided to reinstall the game hoping it would get fixed. Supposedly audio for ( Gunfire, Foot Steps, and when Switching) was on Effect Sound Settings including the Sounds when hovering the cursor to ( Server Selection to Room Selection, Settings and etc.) which I got no problem only the (Gunfire, Footstep and when switching weapon)