Designing a TR-606 style hi-hat from scratch

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Simulation in CircuitJS: https://tinyurl.com/yr9zskbg
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Synthesized, analog hi-hats are pretty fascinating. That’s because emulating any kind of cymbal using an analog circuit is tough, since the sound a real cymbal produces is not quite pure noise – but also not really harmonic.

Still, a couple classic drum machines like the Roland TR-606 and TR-808 took their best shot at it, with quite strange sounding results that I personally really like. So I decided to follow suit and came up with this simple, but very versatile and crunchy sounding DIY hi-hat circuit. If you want to build along, here's the bill of materials:

RESISTORS
1M x1
470k x1
120k x1
100k x16
82k x2
68k x1
56k x1
51k x1
47k x3
39k x2
33k x2
22k x1
10k x2
680 x1
470 x1
100 x1

CAPACITORS
1u x1
470n x1
100n x6
10n x1
3n3 x2
2n2 x1
1n x3

POTENTIOMETERS (ALL LINEAR)
250k x1
100k x1
10k x1
1k x1

DIODES
1N4148 x4

TRANSISTORS
BC548 (NPN) x4
BC558 (PNP) x2

CHIPS
TL072 (dual op amp) x2
40106 (hex schmitt trigger inverter) x1

Chapters
00:00 Intro & Sound Demo
01:30 Hi-Hat Basics
03:21 Metallic Noise Gen
06:25 Bandpass Filter
13:55 Distortion/VCA
19:12 Envelope/Gate-To-Trigger
22:10 Highpass Filter
26:50 Open Hi-Hat
28:32 Tune Control
35:34 Outro