This is an all analog synthesizer module used to alter the timbre and create new harmonic content.
It consists of two identical full-wave rectification circuits, which can be used separately or one cascading into the other. Each circuit has a manual bias offset as well as external CV that can be used to offset the bias
Panel is by clarke robinson, 6hp wide
http://www.bartonmusicalcircuits.com/fwd/documentation.pdf
Module is available as a DIY project only.
This Module is currently available.
$125