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Title: Synthrotek ADSR Eurorack Envelope DIY Kit  
Category: Audio Equipment  
Brand: Synthrotek  
Description: A compact 4HP envelope generator kit that offers adjustable ADR or AR modes with CV control and self‑cycling capability.  
Details: Features include 4 ms–2 s stage times (extendable to ~4 s with CV), exponential or linear curves, LED stage indicators, and a 5 V output with 30 mA current draw.

Price is $