Music switch does not respect window focus

[Sizzle]

Try playing in windowed mode, set a TIMELIMIT of 1, click away from srb2win, and wait for the time to expire. The music will play despite no window focus, which should supersede the music change.

---------- Post added at 11:00 PM ---------- Previous post was at 10:40 PM ----------

Most (all?) sound effects don't, either.