Nice layout. I agree with Kildor that the all sound check box shouldn't be removed.
The sound settings look like they get saved when I exit, though I like options, so it would be cool to have the check boxes added, and I think the sound page is a bit bare so a couple of check boxes would actually make it fill out a little, aesthetically speaking.
Though, instead of using check boxes can we have speaker symbols that get an x through them when we check them or maybe just a slash /? And can we also have those sound bar levels where it starts out as a small column or slash and increases a bit from left to right til on the right side it's a large column or slash representing full volume? It's a purely aesthetic thing, just popped in my head, sorry.
Or maybe instead of a slash or x we could use green speaker symbol for on and red speaker symbol for muted with an onover event where if it is green and you hover your mouse over it then it turns red, or pink, or white, or some other color to show you are about ready to select it, but if you move the mouse off it, it stays green, and something similar for the muted state and red.