i am an happy user of Mackie 1220i mixer on Sierra.
In theory, it is not supported, but it works.

OK, next time i'll buy an hybrid mixer it will be USB, and it will not need drivers on a Mac (i am pissed off by the fact i risk to throw away something that works perfectly just because the drivers are not updated).

But for the moment, no money; so, anybody use it on High Sierra ?
Real return of experience, anybody ?

Nord Electro 5HP, OB-6, Mac Pro, Komplete 11, Arturia collection V, cubase Pro 9.5, Rameau upright.