This thing's finally off the ground, making progress, and making noise. Thanks to Dom for helping me procure the transformer which gives me eight filtered 9V DC supplies (plenty of room for expansion) and one 9V AC for the delay pedal; yes, the enclosure is a screwed-down takeaways container with soldering-iron holes in it. It can be seen that neatness isn't my priority; I ain't even gonna show you the insides of any of the boxes. The chassis is what's left of an old piano I've been salvaging for various furniture pieces about the house.
The signal chain right now is: gat, home-made fuzz/distortion, dunlop crybaby for bass, moog LPF with expression pedal to frequency, ZVEX ringtone, home-made fuzz, home-made buzzbox/weird tremolo-ringmod into buzzbox, line6 delay modeler.
The old piano pedal acts as a no-intermediary expression pedal for the delay pedal: when the pedal touches the nail it shorts a resistor across the expression pedal jack and switches between two delay settings. I want to do something similar with the other piano pedal to get another foot-control for the LPF, but that'll probably have to be latching. Next pedal is a multi-octave thing little more ambitious than what I've built there.