Muting audio automatically when in background?

I'm currently using Parallels primarily to test screen reader support on Windows, and the screen reader gets pretty noisy sometimes. I can deal with that when I'm actively working on it, but it'll sometimes read out system notifications like battery alerts when I'm in a meeting or when my laptop is closed which is kind of annoying.

Is there any way to set Parallels to automatically disable the audio output of a VM that isn't focused? I haven't been able to find anything for this in the configuration window, so it seems like it's probably not possible, but I'm hoping I'm just missing something.
 
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