MXR M225 Sub Machine Octave Fuzz/Octave Guitar Effects Pedal with Independently Switchable Octave Up Effect and Parallel Serial Switch for Octave Down Fuzz Processing with 2 Path Cable Get massive fuzz and glorious sub-octave growl with the MXR Sub Machine A brilliant combination of the MXR La Machine Fuzz pedal with sub-octave circuitry Separate volume controls for main volume and sub octave let you dial in an ideal mix Series switch toggles wether sub octave signal goes through the fuzz circuit guitar pedal guitar pedals pedal guitar pedal for guitar guitar multi effects unit Octave footswitch kicks fuzz signal into octave up mode for a wider tonal spread and True-bypass switching preserves signal when effect is off