(via Wah Wah Watson, Guitarist Whose Sound Was Everywhere, Dies at 67 - The New York Times)
…Working the pedal with prodigious and playful subtlety, he used it on many hit songs — for crunching syncopations and floating, curling chords in the Temptations’ “Papa Was a Rolling Stone”; for slinky countermelodies in Marvin Gaye’s “Let’s Get It On”; for chattering propulsion in Rose Royce’s “Car Wash”; for little bluesy sighs and rhythmic nudges in Gloria Gaynor’s “I Will Survive”; and for airborne, echoing interjections in Maxwell’s “Ascension (Don’t Ever Wonder).”
One of his signature sounds was a luxuriant swoon, a combination of wah-wah, echo-delay, fast tremolo picking and a downward glissando that became synonymous with sensual R&B. He was widely admired, and imitated, by guitarists seeking the essence of funk…