This one time Sputnic module has been updated by several contributors.
Information about the module can be found from the Synthcube information page and on Muffwigglers:
Many of the enhancements developed by Dave Brown for use with 15V are adopted with the kit. Thanks Dave for the great documentation! http://www.modularsynthesis.com/roman/buchla266/266sou.htm
Romanf’s 266 module development is described further in these muffwiggler threads: