^^^
That is all good information, I would add the following if you do use the mix:
One time I was playing around before a show and accidentally turned the mix back on which I normally never use.
I assumed that 1 and 2 were mics 1 and 2, 3 and 4 were mics 3 and 4 and so on with the mix being 7 and 8, BUT
when I checked with Sound Devices because the sounds were not jiving with what I expected soundwide (like my omnis sounding more bassy than my cards), I was told by them, the mix is on (polywave) 1 and 2, which did jive with what I was hearing, but seemed to me to be counter intuitive. So my mics 1 and 2 were on (polywave) 3 and 4, my mics 3 and 4 were on (polywave) 5 and 6, and my mics 5 and 6 were on (polywave) 7 and 8.
So unless there is some way to change or select where the mix ends up on the polywave, one might assume they are the last 2 tracks, but they actually are the first 2 tracks