This Module is currently available.
expander for the E950 Circuit Bent VCO
E951 Looping Expander for the E950 Circuit Bent VCO.
Primary thread: https://www.muffwiggler.com/forum/viewtopic.php?t=167552
Additional older info: https://www.muffwiggler.com/forum/viewtopic.php?t=158084
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These merchants probably sell this module. Huh?