5.1 sound setup issues

[Lesthegringo]

After finally getting 5.1 surround working on my rig, I am now going through setting up the individual games. I did the AMS config, setting the audio to 5.1, but in game, when the front wheels are locked, the sound comes out of the rear speakers instead of the front. I don't see any other configuration settings I can change, but I know that wheels in front of me should cause sounds in front not behind, so what have I missed?

Cheers

Les