Traditionally a distinction has always been made between monophonic and polyphonic synthesizers. Apart from a few exceptions, on any synth one could either play just one note (like the Minimoog) or more notes simultaneously (like the 5-voice Prophet 5). Monophonic synths could be offered for a lower price compared to their polyphonic big brothers, without compromising it's sonic capabilities. Now we see the rise of the paraphonic synth, this time not driven by reduction of hardware cost, but more driven by marketing and positioning. The paraphonic synth allows several voices to be played independently however they share one filter.
Dave Smith introduced the Pro 2 (derived from the Prophet 12, in it's name a successor of the SC Pro-One), a 4-voice paraphonic synth that allows you to play the four oscillators independently, each with their own envelope.
Moog introduced the Sub 37, a 2-voice paraphonic synth that allows you to play oscillator 1 and oscillator 2 independently.
Korg is introducing a remake of the ARP Odyssey (a duophonic synth derived from the ARP 2600), a 2-voice paraphonic synth allowing you to play two oscillators independently.