jan 1, 1970 - noise gates.
The Kepex, an expander/gate, was originally intended to be used to 'clean up' noisy recordings. But Paul Buff also saw its potential to shape the dynamic envelope of sounds themselves. Engineers found this perfect for 'tightening-up' close-mic'd drums using the Kepex to attenuate the bleed from other drums and cymbals. The Kepex could also be used to create super-dry sounds, by attenuating room resonance in recordings. The inclusion of a 'key' input added even further functionality. It was the first product of Allison research, later known as Valley people, and it was released in 1970.
Added to timeline:
unit 5 music technology in context