Electro-Harmonix HOG2 Guitar Octave Effect Pedal Sophisticated new algorithms to improve the quality of the ten generated octaves and harmonics as well as the Freeze function; Foot controller sold separately Full MIDI control over all parameters and presets Master Volume for added control and convenience; Volume levels are saved as part of a preset Save and recall up to 100 preset programs with the optional foot controller (versus six with the original HOG) Controllable harmonic intervals: -2 octaves, -1 octave, original note, +5th, +1 octave, +1 octave +5th, +2 octaves, +2 octaves +3rd, +3 octaves, + 4 octaves