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We are currently doing the exact same thing you are wanting to do with a digital split as Jeff was suggesting. The dual rack mode is not really what you are wanting. Like others have said it works just fine. You can map all the inputs from one system to the other. The gain is set by the originating mix rack. The split only has trim available to it.

We map a production feed to FOH so we can play back audio through the house from videos they run from production. Production also takes our audio channels and produces audio for the dvds, streaming and cd recording. Works great.