Prophet-5
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The Prophet-5 is an analog synthesizer manufactured by the American company Sequential. It was designed by Dave Smith and John Bowen in 1977. It was the first polyphonic synthesizer with fully programmable memory.
In the Prophet-10, a pair of Prophet-5 sound boards provide ten voices
Sequential Prophet-6 (2015)
Polyphony is a property of musical instruments that means that they can play multiple independent melody lines simultaneously. Instruments featuring polyphony are said to be polyphonic. Instruments that are not capable of polyphony are monophonic or paraphonic.
Typical monophonic synthesizer: Moog Minimoog
Typical duophonic synthesizer: ARP Odyssey
The Korg Monologue is a monophonic synthesizer with two oscillators and programmable note priority.
Each key on an acoustic piano is connected to its own hammer-and-string sound-producing mechanism.