DeArmond Square Wave Distortion Generator

Now this one is quite a mystery to me. Analogguru's schematic matches the gutshot at the effectsdatabase, yet the demo suggests something quite different from your average Dist+/250 clone. Schematic states that the pot values are guesses, but there are clone build reports around the web.. So. However it may be. Here it is. The Almighty DeArmond Square Wave Distortion Generator.