Unreal 5: Set sound mix class override ISSUES

Since the update, there are some strange issues with this feature. Sometimes it works, sometimes not at all, whether on the volume or the pitch, it reacts completely randomly. I specify that I have no problems with previous versions of Unreal 5 with the same project.

I second this for 5.1.1, in my case it’s not working at all if called during the Init event of a GameInstance blueprint. It’s clear that the focus now is on the new audio system, but there are still many 4.27 users out there. So for some, backwards combability of blueprints is a must.

What is the “new audio system”?

I still can’t figure out what is the right way to control volume of sound classes globally, or even if sound classes are correct way to do it. There’s many tutorials, but pretty much all of them seem to just be different shades of doing it wrong. Is there some new audio system that has a right way of doing it?