I can't help you at all with this, but there is an interesting variation on this fuzz called the Wattson Classic Electronics EFY-6, which takes the original Univox Super Fuzz and adds some more controls. The tone switch is changed to a tone knob, and the amount of octave is controlled with a knob also.
https://tagboardeffects.blogspot.com/2016/11/wattson-classic-electrons-efy-6.html
https://tagboardeffects.blogspot.com/2016/11/wattson-classic-electrons-efy-6.html