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EASY. this was spurred on from looking inside and seeing each band had its own card. with an input and an output.

All it basically is is wires coming from those cards going into a big mixer with 1 dual opamp driving it! based on the cgs simple dc mixer. it just mixes all of the signals together at a ratio of 1. below is a stripboard layout for the super simple mixer, just add as many inoput jack/knobs as you want in theory.