Well I found some threads how to fix sound loops and make the longer than normal:
http://steamcommunity.com/app/218620/discussions/15/43099721383227159/
http://steamcommunity.com/app/218620/discussions/15/540744299835792525/

But I have no idea about them. What shouldI open? How should I edit it?
Can someone please make a step-by-step tutorial?