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Hi Andreas,
I’m not 100% sure I understand the question, but here is an attempt:
Each rack is capable of mixing 64 channels. If you use them in a split format, you can select inputs to come from either your local system rack (FOH for example), or PortB, which is coming from the other system (Mon). I believe that Preamp functions still needs to be controlled by the monitor system.

If you use this as a DualRack system, you won’t be able to use both surfaces, but you gain more inputs on a single system.

Doesn’t sound like the answer you were hoping for, but hope it helps a little.

Gil Parente
Design & Integration
Entertainment Arts, Inc.