A duophonic, analog synthesizer manufactured in the Soviet Union from 1982 to 1990. Also known as the Polyvox, it has a very unique appearance and sound, and is probably the most well known Soviet synthesizer made. Polivoks was designed a Urals Vector and produced by the Formanta Radio Vactory. It was intended to sound similar to the synthesizers released by companies like Roland, Moog, and Korg during the same time period. The filter can be switched between low-pass and band-pass and the envelopes can be looped over the attack and decay sections.