Polivoks
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The Polivoks is a duophonic, analog synthesizer manufactured and marketed in the Soviet Union between 1982 and 1990. It is arguably the most popular and well-known Soviet synthesizer in the West, likely due to the uniqueness of both its appearance and sound.
A working Formanta Polivoks synthesiser
Polyphony and monophony in instruments
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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.