In a discussion about op amp fuzz pedals at DIYsompboxes, it came to light that the schematic for the EHX Muff Fuzz that had been floating around for years had a number of errors. With the help of the generous contributors on the forum, I drew a schematic from pcb pictures that were posted.
If you want this new schematic for the EHX Muff Fuzz then check out the AMZ Schematics page.