constrain · a run snapped to a scale

A line, snapped to a scale

A full run of every step:

run: 1 2 3 4 5 6 7 8

Quantize snaps each value to the nearest in an allowed set — so the same run bends onto the chord tones:

chord-tones: { op: quantize, allowed: [1, 3, 5, 8] }   # → 1 1 3 3 5 5 8 8

…or onto a pentatonic:

pentatonic:  { op: quantize, allowed: [1, 2, 3, 5, 6] }

The melody bends to fit; the set of allowed notes is the context you project it through. Same idea as choosing a scale for a phrase — here it filters which notes a line is even allowed to land on.