Oberheim Four Voice synthesizer

A major improvement from its monophonic and Two Voice predecessors, the Oberheim Four Voice combined four synthesizers with a four-octave keyboard to produce four voices or notes simultaneously, and some very diverse and complex sounds. It was used through the late 70s and early 80s by artists such as Depeche Mode, Pink Floyd, John Carpenter, Herbie Hancock, Rush, Patrick Moraz, and Tangerine Dream. Despite its technological achievements, which also included programmable memory, the Four Voice was completely eclipsed in 1978 by the massively successful Sequential Circuits Prophet 5, which boasted more sophisticated features and a relatively more affordable price.