as far as I know, aces high only uses 2 channels anyway.. there is no front or rear.
Aces High uses one channel. Sounds should be mono. DirectX for Windows is what creates the 3D position and makes the game sound like stereo, 5.1, 7.1, or what have you. If you use stereo sounds as input then that screws everything up. I'm not absolutely sure, because I think you would have to know how the game is designed, but I think sounds are preset for each model with an impulse location for guns, engines, turrets, and so on. But, if you do not use mono sounds then the position starts to get a little confusing, especially one you have a high speed merge involved and Doppler effects kick in. DirectX could certainly dial back on the Doppler, but it is possible to adjust for DirectX the way it is. I think what is confusing the situation even more is using stereo sounds, with 5.1 speakers, or worse yet 7.1. That is like going into a canyon situation, screaming for help, and then following the echo for a way out.