I couldn't resist. Gest now has exponential and bezier behavior. With Gest capable of drawing step, linear, exponential, and bezier line segments, it now officially has equivalent functionality to my old libline library, but better:
Gest also uses proportional rhythms similar to an even older project of mine called Prop (a rhythmic notation system). I've got a ways to go before I can do some of the stuff found in there, but it is very very close:
both prop and libline failed for the same reasons (clock drift), which Gest addresses (and fixes) via using a phasor as an external clock signal.
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