Another request, there you go Vince! :o) From a 1974 Electro Harmonix ad:
This fine distortion device is high on sustain and low on distortion. It is designed for the guitarist who wants his axe to sing like a hummingbird, with sweet violin-like sustaining sound. The sustain control allows you to optimize long sustain with a hint of harmonic distortion. Jimi Hendrix relied on the Big Muff for his smooth, mellow, supple Electric Lady sound.
