Pigments lets you quantize how the coarse pitch tuning of the Engine responds
to any modulation source.
In effect, modulation can “play” runs and scales.
The pencil icon brings up a mini-keyboard where you decide which pitches notes
will quantize to when modulated.
You could set up the major scale only, for example, or a blues scale.
Note that the modulation amount coming from the source has to be enough
to “clear all the hurdles”, so to speak.
The Analog, Sample, Wavetable, and Harmonic Engines all feature Mod Quantize.