Does anyone have experience with the uTrack24? 

Specifically

1) thoughts on audio quality

2) works with Linux? 

3) do you need a computer to have use it as 24 in 2 out with control over mix? 

https://cymaticaudio.com/utrack24-productpage/

I was thinking pairing with a few of these (or similar) for 24 channels of modular into the computer