@ProfiChiller
I edited the sound of the minigun before (replacing Besra/A-10 Thunderbolt cannon to GAU-8 Avenger sound a few years back) just can't remember the name/s of the files you have to edit?!
I know the minigun sound is also used for some aircraft machine guns & probably the Buzzard's guns too. So be aware changing the sound will affect those in-game sounds also.