Goat Head plugin select the option "9v power

select the option "9v power supply included" in the power supply drop down box

are where the guitar makes its stand

So when changing clipping diodes we included circuitry that level matches the output of the pedal as various clipping diodes are selected

With the FUZZ

Screw Gun or Phillips Screwdriver

Goat Head plugin select the option "9v powerSIMPLE TO INSTALL To install the FUZZ MODULE, please perform the following steps: 1) Remove the back panel of the pedal using a Phillips screwdriver 2) Lift up on the sides of the plug in that is currently installed until the plug in lifts up and out. 3) Take the new plug in and align the pins of the three headers into the header sockets and gently press into position. NOTE: The plug in is keyed so that it cannot be installed backwards. 4) Reinstall