The Silt Harmonic Fuzz is a two-in-one fuzz pedal designed with Jim Hagerman, featuring a 12AU7 tube drive. It has a harmonic mode for unique lead tones, contour control for tone precision, and operates between 9V and 12V for added gain. This unit offers true bypass for maintaining the original sound signal. The pedal is designed for generating rich fuzz tones and harmonic overtones.