Kudzu krawler

I have several Macs, and so does my SG, we are wondering why on our windows machines, CoX sound effects and music files play normally, but on our macs they play at double or triple time, and sound squelched.
For example : when you enter an arachnos base, there is foreboding music with a lot of bass in it...when we enter on a client machine that is a mac... it sounds like chipmunks are fighting no a trumpet. We have tried reinstalling, nothing helps...ideas? fixes?