A metallic hi-hat module based on six square wave oscillators.
Warning: this produces quite some noise, I suspect it’s leakng from the internal VCA. Still have to troubleshoot further.
The oscillator bank can be tuned by tweaking the values of C1 and R1, C2 and R2, and so on. You can even replace the resistors with a trim pot to make it more versatile.
KiCAD files can be found over at my Github page.