The Moog Sonic Six [video]

The Moog Sonic Six is an an outgrowth of Moog's expansion in the early seventies, when it took over a smaller company called Musonics, which made a synth called the Sonic V.

Moog took the Sonic V design, updated it with more Moog-like features (S-trig, three-stage Minimoog-like envelopes, etc) and released it as the attache-case-mounted Sonic VI.