Available as an assembled Module and as a DIY project.
This Module is currently available.
CV generator
The CGS775 is an extremely versatile control voltage generator and audio source. In the early 1970s, Serge Tcherepnin developed the Positive Slew and Negative Slew modules for the original Serge synthesizer. In time these merged into the classic Dual Universal Slope Generator. The CGS775 is an adaptation of Serge's original circuit with a few new features.
https://www.elby-designs.com/webtek/euro-serge/es75-serge-vcs/es75.htm
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These merchants probably sell this module. Huh?
Elby Designs ES75