I applaud the effort
, but there does need to be a separate volume slider for the voices, and an option to turn them off completely. I like to turn the game sound way up, mostly for the ambiance, but then the voices are distractedly loud.
As for ambient sound, some kind of low-volume background 'command center' sound of people mumbling, coughing, moving around, etc, might be cool. If anyone here has played Defcon on Steam, you know what I am talking about.
How can I currently turn the voices off completely in the beta? I suppose I could delete the voice files? :p