I started out wanting to note that I couldn't figure out which Audio option to disable so the game would be quiet when I tabbed to another window. I still want to be able to do that, but the fact that I can 'disable' all audio options and still have some 'atmospheric' audio playing seems like a bug-bug, not just a preference bug.

In the instance I have running, my selected unit is just outside our capital. I'm hoping that the muttering, hammering, and horse clip-clopping I hear is indeed intended to be based on the selected unit's location. I also hope it will be clear whether those sounds are SFX, Music, Event Music, and/or Layered Music (the and/or bit there is especially vexing).

Most of all, I hope that the game will simply be silent if it is not the active window regardless of audio settings.