 Poly is without explanation, and oscillators always play in sequenced order from 1-4.The main drawback of the Mono/Poly is that the 4 VCOs share one common VCA and VCF envelope, like all the knobby monophonic synthesizers like MiniMoog, but there are triggering and auto-dampering switches to compensate for the envelope sharing.This synth was not so much designed to be a polysynth like its sister the Polysix (which was manufactured at the same time), but more of an experimental synth with different footages and waveshapes per oscillator.