CV Echo
http://www.synthrotek.com/products/modular-circuits/echo/echo-schematic/
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.
The ECHO (formerly known as the EKO) is a compact voltage-controlled echo/delay comes in the very tidy size of 4HP and is certain to be one of the best bangs for your buck. Power Draw: +40/-20mARate range: 30-190mS4HPVoltage-controlled rateSelf-oscillating feedbackMix contro

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