You mean a stereo sound? BF1942 doesn't really support surround sound systems.

In BF1942 there is only two types of sound files. Mono channel sounds and stereo channel sound. Stereo sounds lose their directionality in this game, so if you were for example to make a gun fire sound in stereo and used it ingame, you wouldn't be able to tell which direction it came from because the game engine doesn't allow for it on stereo sounds (quite a bummer I know

).
However stereo sounds work great when used on things like the footsteps for soldiers or the 1st person gun fire sounds (sounds only heard by person firing the weapon). Since it is always at the player position, directionality isn't important. Stereo sounds can also be used for ambient sounds like the global ambient sound for the map. However careful with using stereo on ambient sound objects. It tends to cause problems with hand firearms sound effects not working. You will need additional code to extend some buffer limits if you intend to use stereo sounds on a ambient object.
It's not really important to use stereo sounds on things for 3rd person view since the game engine converts it to stereo when it plays back to you since it adds directionality to it. Therefor technically all sounds you hear ingame that aren't originating from you are in fact in stereo.