How do I make my own feedback pedal/controller for the Echoplex?
If you feel compelled to make your own pedal, use a 20K or greater pot. Linear is better, but log works too. The value and taper just change the feel of how the pedal controls the feedback. The circuit is very simple, with the tip of a 1/4″ jack connected to the wiper, and the sleeve (ground) connected to the bottom end of the pot.