[PROBLEM] USB Volume Knob breaks output

[Tim Curtis]

I ran a quick test with a USB knob I had on hand and no issues.
https://www.amazon.com/gp/product/B01MV4...=UTF8&th=1

Maybe some issue with the particular USB knob that you are using?
The log show what appear to be 2 USB Audio devices
2:AudioHIGH | 3:AudioMID