A monophonic synth introduced by Moog Music in 1970. Prior to that time, Moog had produced only modular synthesizer systems -- the ultimate in flexibility and sonic capability in its day, but large, heavy, and difficult to manage when playing live. In 1968, Bob Moog had conceived of the idea of a stage synth, containing the most-often used components from a modular, and simplified routing choices selected via the use of panel switches instead of patch cords. Over the next two years, four models were prototyped: