Below is how I think I would proceed with the circuit. For the time being I will socket the IO and II pads and jumper the two until I can obtain the proper jacks needed for Insert Out and Insert In. I will eliminate the kill switch obviously and the OD/Distortion (Emexar in this example but will be something else when I build it). The block diagram below is the basic plan.
My planned board connections. I assume that SW1 is a phase switch looking at the schematic, but I am not really adept at IC circuits.