Using a Multi-Dimensional Processing technology, otherwise known as MDP, Boss has constructed the MO-2 Multi Overtone. This pedal uses your guitars harmonics to build upon and create a wide range of new tones. Rich harmonics that complement rather than overtake your guitar's sound are characteristic of the MO-2, and three different sound modes as well as 3 knobs allow for extreme tonal adjustment. As a pedal that's highly responsive to both clean and dirty signals, the Boss MO-2 can shine up any input tone with cool harmonics.