Nademan

Hey there, i would like to replace the firing sound of the gauss rifle with the bolt rifle from crysis 3 and the charge sound with a more humming one. i have seen a mod which replaces most of the ingame sounds so i know it is possible right now and was wondering if there is some kind of a tutorial for this specific request. i have never created a mod myself and would just love to hear that thing ingame, so i would like to give it a go but i need some help.