The Uglyface is a circuit designed by Tim Escobedo. It takes the input signal from your instrument, amplifies it with a
386-type amplifier IC, and uses this to retrigger a free-running oscillator made with a 555 counter IC. In addition, the
input signal’s envelope can sweep the frequency of the oscillator. The end result is a buzzsaw synthy distortion,
capable of octave effects and faux-resonant filter sounds.
This board supports board-mounting the pots, but also has holes for standoffs if you prefer.
Here is a thread with build pictures, questions and answers on building the Uglyface PCB.
Here is the build PDF with bill of materials, wiring diagram, and schematic.