There’s an editor setting for Allow Background Audio, is there nothing similar that can be used for actual packaged games?
There are any number of scenarios where it would be useful to not have the game become muted when tabbed out, and it seems like this behaviour can cause certain audio loops to just stop (at least with the old audio engine, haven’t upgraded to the new one just yet).
Edit: after a little digging I found this post relating to the conundrum, there’s apparently an engine setting you can configure to adjust the volume when the program is in the background.