I’ve been wanting to build this interesting voltage-controlled noise source for a while, and now boards are available from hexinverter.net for a modest $15.
The Liquid High Hat is a voltage controlled noise module designed by Ryk John Miller Thekreator. It is capable of producing high-hat sounds, but is also usable for other noise generation via control voltage. It is designed to run on 9/12/15V split supply, so should work with most any modular setup. It is comprised of very common parts, so there is no need for hunting down obscure/rare parts.
Hex Inverter Electronics has designed a circuit board for this cool project, to make it available for everyone.
UPDATE: Matrixsynth posted a demo video (not the greatest demo but you’ll get the idea)