HP-2 is a distortion device, based on the Interfax Harmonic Percolator. Harmonics (H) controls the input level and Balance (B) controls the output level. The orange rocker switch selects each clipping mode: switch left for germanium diode and vintage fuzz, switch right for a no-diode lift and modern distortion.

Excellent condition with only very small nicks in the finish left of the Output knob and LED. minor scratches on the bottom of the chassis.