I just got a Sixaxis controller and I'm using it with Mupen for the first time. I'm getting an annoying problem and I just know there's a simple solution to it but I can't figure it out.

My "x" button on the controller is making Mupen pause! It's really bugging me! I don't understand why because the Sixaxis "x" button is bound to the Z button on the N900 keyboard, and that should not pause Mupen.

Can anyone help me to stop this happening? Thanks a lot.