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Yes, you can replace the existing sound files with other ones, as long as the file name is the same. Just copy the new sound files into the Sounds folder for GrandPrix Race Manager to replace the current file(s).

Currently, though, there is not a way to modify the button images.

If you are looking for more flexibility in sound effects and the ability to play a lot more sounds, check out our RaceFX Sound Effects Player software at http://grandprix-software-central.com/rcfx/.