Each of the four oscillators is assigned to a different note. In this mode, all notes share a single filter and envelope generator.
The "MonoPoly" name comes from its ability to function as both a powerful monophonic synth and a 4-voice polyphonic (paraphonic) synth. KORG MonoPoly v2.0.3
You can download the official Mono/Poly Owner's Manual or the Setting Chart from the KORG Support page. Each of the four oscillators is assigned to a different note
All four oscillators are stacked for a single note, creating a massive, thick sound. creating a massive