No info about availability.
Noise for high-hat sounds
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. ?
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These merchants probably sell this module. Huh?