So I tried that and it seemed to indeed fix that case which is excellent. Thank you for that.
So now we are just left with the case where the AppVolume isn’t 0 but the sound class volume has been lowered (via the users options to turn down say the SFX). In this case you can hear the pops as clearly as before without any reduction to their volume.
I have uploaded a new video so you can see what I mean. In it the master volume is near 0, and you can hear the pops, then i set it back to an about 0.6 where the sound seems to mostly cover them and back low to hear them once more. This in our actual build, which is 4.16.3, but with the fix above applied (which stops all pops when no focus).
Any ideas how we can fix those?