Can sumone make a Cool Edit Pro Tutorial?

Sup people, I’ve been trying to make pellas for about a year now and havent been able to make one use’able pella. Anyway I have alot of Promo’s that come with complete instrumentals and everything and still cant seem to Invert them. Ive checked WarBeats video and still nothing. I use Cool Edit Pro 2.1, Line Up the Instrumental/Song perfectly, Inverr the instrumental and still when im done i end up with the same stuff, now i know the Instrumental gets Inverted b/c i see the wave form change but for sum reason when i play them both its the same always, tried with 5 different songs all official instrumentals and everything. So how the hell do i do this? Can sumone make an Cool Edit Pro tutorial please im begging you, I will Share ALL PELLAS PLEASE HELP ME HELP EVERYONE