Sound Not Muting when Alt Tabbed

[Zxizar]

It's a curious thing that makes me twitch, as over the years I've gotten used to more and more games having the option to NOT be muted when alt tabbed to a different window/the program is in the background. 

I'm already impressed that the devs here have made the engine improvements that they have, though, I must say! Borderless Windoweed mode and 64 bit client! Excellent. :]

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