To answer to El Heisenberg, I saw the OC2 schematic but it's maybe, too complexe although I understand how it works. Beside I'm gonna buy one. I'm looking for something simpler and easier to build. The OC2 isn't complicated but needs a lot of attention to make a layout or worst, a veroboard. But maybe there's any other ways to build an octaver down pedal.
I'd like to build an octave box that contains an octave up and octave down with a clean blend (similar to Foxrox Octron or a Pearl pedal). I've almost finished to design the octave up effect but I know nothing about the octave down and how this octave is produced. So maybe my question can be stupid.
For the Shocktave, I think I read that sounds more like a vintage synth, producing a kind of scare wave , a nintendo sound (but maybe because of the outuput drive gain stage)
For the pog isn't analog, it uses a DSP.