The modular system once developed by Robert "Bob" Moog, including its development process, went through a long production period between 1964 and 1981. At that time, the novel, electronic instrument was an avant-garde pioneering work that still had to be explained to the public; but eventually found more and more interested parties. The modules and systems are still considered a blueprint for what a modular system is or can be and how to use it.
Behringer System 35