The Minimoog is a monophonic analog synthesizer, invented by Robert Moog and David van Koevering. The Minimoog can be controlled using its in-built, 44-note keyboard, which is equipped with modulation and pitch-bend wheels, or by feeding in an external one-volt-per-octave pitch-control voltage and triggering the envelope generators with an inverted trigger. First released by Moog Music in 1970, it was among the first widely available, portable and relatively affordable synthesizers to hit the market, and is still in high demand today for its remarkable sound palate.