I just found out about the new Roland Rubix 24 sound card: https://www.roland.com/us/products/rubix24/
It's USB audio class compliant and all the functionality is controllable with knobs and switches on the hardware, so it should be fully compatible with Linux. I haven't heard one of these myself, but the specs look on par with the Focusrite Scarlett 2i4 so I presume it sounds quite good. This has a few neat advantages over the Scarlett 2i4 although they are the same price. It has a hardware limiter for the inputs, so the inputs can be compressed while using direct monitoring, which would be especially nice for broadcasting with Mixxx. It can also run standalone from USB power (a cell phone charger) without a computer. I think this will be my new generally recommended sound card for Mixxx.
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