Here's a very cool synthy sounding octave down / up invented by Slacker (the creator of The Echobase). Original thread here. I included the Octave up addon from the schematic aswell. I had to use shitloads of cuts and links in this layout, but at least I got it into a good size. :)
I did have problems getting this one to work/track properly. Only the low E and A strings tracked and I had to hit the strings hard. Here is what I did... Probably not the best solution lol, but for now it's good enough until I have more time to try out other things. If you want to build it 1:1 with the schematic, just omit the 47K resistor. Here's a short soundclip of the circuit/layout (with my fix):
I'm using humbuckers, neck pickup, mix at 50%, Octave up maxed and 2nd octave down selected.
Another Octave Down, very different from the Synthbox. Cleaner and bassier octave.
Modded by me for true bypass. Have a look at my completed build here.
This circuit is a bit below unity gain, but John Kallas did his own version of my layout with an added boost daughterboard. Check out his layout here.
All the layouts are Verified unless noted.