3.5. Polyphony
A Polyphony Zone runs a separate voice for each note. The voice nodes stay visible on the current canvas, and cables decide membership. Voices and polyphony defines voices, while the child pages teach creating, routing and controlling them.
Suppose you want a chord through one shared delay.
Put the oscillator, envelope and VCA inside the Zone, then put Delay after Polyphony Output. The Zone sums the separate note voices before the shared effect, so one delay processes the entire chord.