Based on the EF in the Buchla Easel
https://www.nonlinearcircuits.com/modules/p/4hp-envelope-follower
If you had an Unicorn Account you could see a chart with the price development of this module and the average price asked for this module.
Nonlinearcircuits Envelope Follower eurorack moduleGreat module for getting guitar into eurorack, and moreThis is a factory build, bought it assembled from NLC in 2021.Works 100% and in excellent shapeRibbon cable included

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