I’m curious to know: did you get all 8 channels working properly? I have this same mixer and, under Linux (Lucid/Ubuntu Studio), I have gotten it to record 2 channels at a time, but I’ve never been able to record all 8 channels at once. I assume that when you say “everything appears to work” you mean that you can select any combination of the 8 channels to record?

If I can follow your footsteps and get my mixer fully functioning under Linux, it would do wonders to restoring my sanity.