Shades, I beg to differ, please about the volume booster not doing what I expect.
I did try out one of them on its 14 day trial, and it really did amplify the sound a LOT - we were quite pleased. That aside, the volume would dip periodically to its normal top volume and then gradually (thankfully) return - and that I do attribute to the volume booster program.
I understand what you mean though (I think) about the Atmos audio setup and how it could conflict with the output when its not actually present.
I was just thinking maybe some program could amplify the sound my computer puts out, regardless of what systems are used to understand the streaming input. I mean, if you can use a small app to capture the sound sent the speakers, then surely you could programmatically amplify the sound being sent to them.