The original hardware from 1975 was a fascinating beast, much like a string synth, it wasn't polyphonic in the way the later CS-80 or Prophet 5 synths were , the PolyMoog had divide down organ topology running through single amp/filter envelopes. Except that the 16 preset sounds were fully polyphonic - as I understand it. However that doesn't matter here. Lots of great presets/sounds and Xils Labs do a lot of great synths.