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This is workable except for the mixer. The docs say: "Module A-138p is the 4-fold input module, A-138o is the output module that can be combined with one or more A-138p." You are lacking the necessary output module.
You could replace A-138p with an FBP 6 ch mixer. 6 inputs, stereo out, head phone amp, and an fx send to, too. Plus a cue function for pre-listening.
-- wiggler55550

Thank you, Wiggler55550!! You really saved me a bunch of heartache. I'm scanning around for alternatives now (I couldn't find the FPB unit for sale anywhere).

-- Lusiad

You may ask here: http://fpb-synths.de/kontakt