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Spot on (re; autotune)!
It could be a shim as well, that simply feeds back a voltage (or pwm, or freq?) as a function of the cap.sense. Should be doable with a small attiny85 or some such. (Probably way too overkill for the feature though.. my head just started spinning).
Maybe it's a project for showcasing your Dream Protoboard @DrAzzy? ;)
alexanderbrevig
Ahh, an auto-tuned theremin? :)
I think to get proper capacitive sense on Espruino you'd really have to set up the hardware timers. Doing it with software is possible, but probably not very good.