Mr. Moog wasn't the first or the only engineer working to perfect the modular synthesizer, a much more complex electronic instrument that could produce virtually limitless tones. But while working with composer Herb Deutsch, he was the first to grasp the practical applications, attaching an easily playable keyboard where previously there had been a morass of jacks and wires resembling a telephone switchboard.
http://www.suntimes.com/output/enter...tr-moog23.html

Man, I remember in high school, dreaming of owning one of those things.