Available as an assembled Module and as a DIY project.
No info about availability.
CV Echo
The ECHO (formerly known as EKO) is a very unique echo using the PT2399 IC featuring Voltage Controlled Rate. Manual controls for Rate, Feedback, and Mix. Beautiful and bizarre, CV modulation of the rate brings in ghostly pitch bent sounds to metallic reverbs. An effects module that everyone needs in their rig.
http://www.synthrotek.com/products/modular-circuits/echo/echo-schematic/
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Synthrotek Echo$67.50
Synthrotek Echo$67.50
These merchants probably sell this module. Huh?
Synthrotek Echo
Synthrotek Echo
Synthrotek Echo
Synthrotek ECHO Kit - Voltage