This is the old fashion approach on a simple analog console.:twisted:
You have matrix outputs available on the X32. I would suggest to use these, but there are several ways of doing it. The real advantage with matrix outputs is that you are more flexible with crossover type of filters available in the eq.
The inclusion of matrices in live mixing consoles is hardly new, nor is it a concept unique to digital consoles... Behringer or otherwise.
That is all.