A monophonic synth produced by Moog Music from 1972 to 1979. (Despite what the name might suggest, the synth is not polyphonic, although it does have duophonic capability.) The Sonic Six is an outlier among Moog products both in its design and in its provenance, since its original design did not come from Moog Music at all. Both its circuit design, and its panel layout and packaging, are radically different from other Moog products of the era.