Some hope for ESI, maybe: https://kb.esi-audio.com/?goto=KB00337EN https://kb.esi-audio.com/?goto=KB00337EN If it's one of those and class compliant, you might

Some hope for ESI, maybe: https://kb.esi-audio.com/?goto=KB00337EN https://kb.esi-audio.com/?goto=KB00337EN If it's one of those and class compliant, you might be able to access all of it through alsamixer or one of the many frontends (maybe too many, maybe one for you): https://en.wikipedia.org/wiki/Alsamixer https://en.wikipedia.org/wiki/Alsamixer The Audient situation appears to be a proper nightmare realm with non-class compliant stuff, but there is a tool with a list of caveats longer than you might want to deal with: https://github.com/TheOnlyJoey/MixiD https://github.com/TheOnlyJoey/MixiD It's more best case scenario as an escape hatch and less problem solved, but it's something.