Hi
This is a mod I'm considering.
I'm intending to wire the octave switch so there are three positions, one will be normal fuzz, the second will be octave and the third will be resistors and a cap set up so it simulates turning my guitar down and rolling the treble back. The idea being that I will only have to turn the effect on while switching to my neck pickup. This is much easily to do on the fly.
As far as mods go this is what I can find.
http://www.generalguitargadgets.com/diagrams/toctpl_body_mod.gif (http://www.generalguitargadgets.com/diagrams/toctpl_body_mod.gif)
Mark
EDIT: I think I'd like to see a new board with the pot mounted directly to the board. The current Retrograde board has either the pots or the input wiring backwards, it is still annoying. It is still a bit better than the GGG board, but in fairness they are different, and have pro's and con's.