Okay not a standalone effect, but the effects panel used in early 70's Kay effector guitars. Might make a nice standalone effect or would be useful for owners of said guitar with non functioning electronics.
Schematic here -
http://inspireformation.blogspot.co.uk/2012/09/the-kay-effector-onboard-effects-madness.html#!/2012/09/the-kay-effector-onboard-effects-madness.html
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