Here’s a fun alternative to the Muff Fuzz circuit using the muff fuzz pcb and a muff tone control. This has become my favorite distortion pedal. Please post your versions/ mods here if you do so indulge.
Here's the last one I put together with an added Gate / bias control. It was built on the old revision, so R2 was 1k, and R5 didn't exist. I also used infrared LEDs for the clippers
Here's how it'd look added to the latest revision-