Hi Runner
It sounds like step one is wrong.
I am saying to plug the KB directly into one channel of your mixer,and anything else you use on other channels. The output from the mixer goes into the Z22/2300 system, and controlled from there.I use an old Boss FV-300l dual line volume pedal from the keyboard, but that's just what I prefer.

Bernie
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact