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What you describe is not really surround, but distribution, so I would definately just solve the whole thing with matrix outs, and not the speaker processor :) as it’s possible to eq and delay the matrix channels separately it should be no problem, assuming you are not using surround fx.

And if you need some fx in surround, I would do these with automation or control from the laptop you mentioned, and a 5-6 MADI channels routed to the different matrixes. You should easily be able to program/automate some fx this way.