After many hours of tinkering, I still can’t figure out how to alter the volume of a Media Player which is playing in the UMG. (See my Answerhub comments here: How to mute/lower sound in Media Player - Audio - Epic Developer Community Forums)
Would be so great if there was a simple way to alter the volume of a Media Player in Blueprint with some simple nodes (Set Volume, Fade Volume etc.), or at least assign a Media Player a Sound Class so that it could be easily altered by pushing/popping Sound Mixes.
It’s entirely possible that it is possible to do these things (perhaps even easily) but I can’t figure it out. Nothing I have tried so far has been able to affect the volume of a Media Player.