How did the light show work?

[Alanko]

Light Organ circuitry seems fairly convoluted for something that is, frankly, a bit of a gimmick.  Many thanks all who have replied. In my head the lightshow 4005 somehow used a 3rd pickup and some sort of tricksy filtering circuit to make it all work. Seems the answer is a bit simpler, and just a healthy chunk of mains voltage powered disco lighting hidden inside a bass.

[Denis]

From The Rickenbacker page, I copied this: "The Model 331- commonly called the "Light Show Guitar" because of its frequency-modulated internally-lit body-reflected the psychedelic 1960s in both sound and substance. The flashing began when the player hit the strings: yellow for treble notes, red for mid-range, and blue for bass. (Rickenbacker also produced a kaleidoscopic light projector called the Phantasmagorian.)"