This High Quality Buffer Board similar to ones used by high end boutique companies solders directly to your 3PDT Foot Switch and can be added to any circuit with ease giving you the signal strength you will need to maintain signal loss when using long cables or pedal boards with many patch cables.
Best of all it's small profile does not take much additional space and will fit easily into a 1590B enclosure along with your circuit.
Build Document with additional details.
The 3PDT Buffer Board Advantage
Because you connected a fairly long cable (15ft. or more), you lose even more of the actual signal and it doesn't appear across the input of the pedal. You are now losing a good amount of the signal from those expensive pickups you bought. . . The story gets better for low frequencies, but worse for higher frequencies.
In Guitar PCB fashion it is also moddable to suit your own tone even further.
You cannot disengage the quality buffer circuit, it is always on whether the circuit used with it is activated or not and with its flat frequency response you would not want to disengage it anyway.
Will easily fit into a 1290 size pedal enclosure.
PDF Diagram of Pedal Chain