I'm working on a World War 2 Weapons Pack, and somebody gave me the idea to create custom sounds and muzzleflashes for my weapons. If anybody knows how to do this, I would appreciate help. This will be used in my Kelly's Heroes Custom WW2 Planet Mod.
Take a look at this tutorial, it's for TSL but both games are similar and it will give you something to go on as a guide.
http://www.lucasforums.com/showthread.php?t=168268)
Hope this helps
--Stream