incident with a game

I was playing a game called Beyond a Steel Sky (unreal engine). I tried 
to adjust the game volume in the game's menu to yield to another process 
for audio output. This caused the audio to become extremely distorted, 
driving my tweeters to dangerous levels. I found that I could partially 
correct for this by using pavucontrol to reduce the output volume from 
each application to about 15% (-45 db)...

There was no setting or reset command in either alsa or pulseaudio to 
correct this. I had to cold-boot the machine to return sound output to 
normal.

The motherboard is a TRX40-based threadripper board by MSI, using some 
kind of audio chip off of the USB bus.

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