I experience this bug with XWA, where during a mission the music suddenly stops playing and starts looping the last 2-3 seconds. It's rather annoying and I don't remember it from the days when I used to play the game on my discs. Is it specific to the GOG version? Any fixes? I'm using Windows 7.

Done by using ImageCfg, in the end

https://robpol86.com/guides/ImageCFG/

which does the same thing, and for now it works! Thanks!