:bigthumb: Now it's time to build an amp!
It’s a unique circuit. The gain knob blends between a clean boost and a germanium overdrive. It’s two separate signal paths.
So at lowest settings you hear the clean boost, and all the way up is just the overdrive.
I have one of the BYOC circuit boards in my parts box. Never got around to building it.
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It is a MXR Dist+/DOD 250/and so on with a clean booster of sorts mixed up....buffered and all of that....

How close was a Guild Foxy Lady to a Big Muff? I heard they were the same...
The Foxy Lady was originally a totally different two knob fuzz, I think also made by EH.
The version I had was a rebranded triangle Muff. It was the same bent steel box and all. Had “EH” etched on the PCB.
All drive boxes are pretty much a variation of a Tube Screamer/SD-1, a Dist+/DS-1, or a Fuzz Face, and for the new "amps in boxes", of the BSIAB. Other than that it's pretty much just changing part values and sometimes adding some features (buffers for the bufferless, removing buffers on the buffered, adding clean blends, adding/subtracting tone controls, adding soft/hard clipping switches, adding diode selection switches, etc...).
It looks like those original Foxey Ladies are different than a Big Muff, certainly. I guess that would be an interesting pedal to build. The demo videos almost sound like there is a wah engaged. Not a 'pretty' sound.