I can’t find any information on this that is not outdated by half a decade. And of course none of the outdated solutions works in 4.21. I want to do something simpler than eat a doughnut: Have a music fade in when my main menu appears, and fade out when I click “start game”. It really is very frustrating, one solution after the other simply doesn’t work. Why is this so hard? 
For Fading In/Out you can follow this: [Main Menu music fade in and out? - World Creation - Unreal Engine Forums][1]
As for the playing and stopping of sound/music:
