For photography and graphic arts, Linux can handle many if not most of the work (I use Digikam and Darktable with great success, for example), yet when it comes to audio for example, it falls short due to a thousand papercuts.
You don't have to be everything to everyone. You just have to satisfy a need.
Yet, Darktable allows me to process my RAWs to a point which I like. Similarly, my audio equipment allows me to create some music which I like, too.
I didn't push Darktable to professional levels, but I believe it can match bigger tools for what I want to do with it. I don't do photo manipulation, for example. Just process RAWs. I expect the same from my audio equipment for my music endeavors.
https://www.reddit.com/r/linux_gaming/comments/1qdgd73/i_mad...
https://support.focusrite.com/hc/en-gb/articles/208530735-Is...
I haven't actually tested it, but it seems like it works for people, and it's solid enough to have the kernel component in the kernel. I found it while researching a possible move with my Vocaster One.
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
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
It's more best case scenario as an escape hatch and less problem solved, but it's something.
I didn't expect Audient to work, actually.