The problem is that in the scene I start the new song a few seconds after I stopped the previous one. So the new one start with fade in but I don't choose or select any fade in effect.It's just how background music works. Ideally it would be nice if Simon added an option to specify if music should fade in/out or play/loop immediately. If he hasn't already done so for vs5 beta then maybe he could consider sorting it out for the official release.