More vactrol’s passive lpg/vca here ! (lpg are my favorites modules) :
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*This one is a really good active vactrol’s vca (for guitar but it working good with my synth):
https://damienclarke.me/effects-pedals/posts/building-a-vactrol-vca/
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*Here a lpg/vca who coming from a pedal effect design by beavisaudio (you can try different capacitors values at “peak” switch). Really nice sound !!
Have fun !