Typical germanium transistor booster/fuzz unit with a few additional features.

It can be use as an input EQ, "attack expander" or as a fuzz pedal. Sigma has only one knob, which function depends on the 4 dip switch settings. The switch, called Setup is located below the knob. There is also internal Tone regulator, a trimpot inside the box. The tone regulator works as a lowpass filter.

HEXE Sigma Boost/Fuzz

The Setup switch performs following functions:

  • 1-2 set the band which is amplified by the pedal,
  • 3-4 set the maximal gain, which corresponds to maximal amount od distortion.