Envelope Generator Module
http://www.synthrotek.com/products/modular-circuits/adsr/
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This Synthrotek ADSR module is in excellent, near-mint condition, providing a compact and powerful envelope generator for your Eurorack system. It features switchable exponential/linear curves, self-cycling capabilities, and a dedicated CV input for dynamic modulation of all stages. This is an essential utility for shaping the dynamics of your sound with precision. It has worked well in my rack but I'm currently downsizing.
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