Distortion / Sustainer / Fuzz A modern recreation of the green Sovtek Big Muff (7B/7C models) distortion, sustainer, fuzz pedal. Harby BMF is built using the highest quality components, including; solid anodized aluminum knobs, Neutrik input/output jacks, Japanese capacitors and resistors. The pedal features volume, distortion, and tone controls. True bypass foot switch. The pedal operates at 9 volts DC using a standard negative center power supply.