Octave Pedals: HELP PLEASE?!?!

[mbass]

A friend of mine asked if I could build him an octave pedal.  He says he just wants a clean, one octave below type pedal, which works for me, but what pedals are out there that can do that job?  I know the Lowrider does FAR more than that and would probably be overkill for what he wants.  I like both the Wolfshirt and the Retrograde, but if I'm looking for clean, would turning the fuzz knob on all the way down give me a clean, lower octave or would is it meant to be run with fuzz in some fashion?  Input would be greatly appreciated! 

[mgwhit]

Merlin Blencowe's U-Boat is available as an etch from his own instructions or as a fabbed PCB from TH Customs.

[cooder]

Merlin Blencowe's U-Boat is available as an etch from his own instructions or as a fabbed PCB from TH Customs.

Yep, I just built that one on a fabbed bord by Thomas and it's great!