An annoyance.
When switching themes the windows default sounds scheme is put into effect. i have to then go to the sound properties to select "no sounds" scheme.

anyway to just have it leave my sound scheme alone?

that's very odd...afaik no themes affect the sound schemes. though the one you're running may have a module running that does that, check through them all and see if there may be one that can do that. (I just checked on mine, and switching between themes does not switch the sound scheme)

You mean .theme files? Yes, I have always observed that as well. Is that a doing of LS? I never knew. Quite possible. As for a fix, no idea :/