System Sounds / other apps automatically lowering my music volume

Basically when I listen to music through foobar2000, winamp, any audio player, windows sort of regulates my volume if any other program makes a sound. System sound rings? Music volume lowers. Watching a video on youtube or any other service, music volume lowers, playing a game? Music lowers.

This problem has persisted through 2 entirely new computers, the only thing remaining consistent is my AV receiver. 2 different brand video cards as well (monitor is hooked into receiver hdmi out, and then video card goes into receiver hdmi input) so both AMD and Nvidia have done this to me so far. I don't recalled if this was an issue before the receiver, it's been way too long.

It was also like this in W7 and now W10.

I find it weird that this isn't a problem when I use headphones. Only my receiver. I've never had this happen with any other component though (blu ray player, ps4, xbox1 , 360, etc). I've also listened to music on those devices and played a game or w/e and it doesn't happen.

It really seems like a windows issue or driver problem, I don't understand how it can't be fixed.

Usually these are the go to things -



The BenQ is the monitor connecting to the receiver, other is my headset.
So I figured I'd ask for help here, there's entire articles dedicated to selecting "Do Nothing" in the Sound Communications tab to stop this problem. Getting tired of reading them.

Thanks!

I supposed this just isn't fixable.