EHX Little Big Muff - Original version

The original Little Big Muff from the 70s which included just a volume knob and tone switch.  To compare it to a conventional 3 pot Big Muff, the circuit is set up as if having a fuzz pot in the full clockwise rotation, so I suppose Electro Harmonix decided that most people would use it that way, so why not do away with the control and just have it dimed.  The tone switch effectively selects between the full clockwise, and full counter clockwise rotation of a Tone pot which may not be ideal for some (I usually have my Tone pot at half way all the time and then just vary it with the tone control on my guitar.  If you would prefer to simulate this half rotation, swap the 100K resistor between Tone Sw1 and Tone Sw3 to a 47K, and then put another 47K in series with either the Tone Sw1 or Tone Sw3 wire from the board (depending which other switchable tone you want alongside the middle setting).