The theory of shifting frequencies using analog multipliers was first invented in the early 1900s. However, in 1971, Don Buchla took this concept and explored how it could interact with the audio signals of his modular synthesizer. By combining it with a balanced modulator into a single module, he likely created one of the world's first analog audio effect processor modules.

Size: 18HP - Depth: 45mm - Power: +12V 50mA / -12V 44mA