Anthony Jackson played bass guitar on the song. One day during fall 1973, producer/keyboardist Leon Huff was leading the members of the MFSB rhythm section and Jackson through a rehearsal. Sigma Sound Studios owner/engineer Joe Tarsia noticed that Jackson had a wah-wah pedal attached to his Fender Precision Bass. Tarsia decided to run Jackson's basslinethrough a phaser, giving it a swishing sound and later mixed in echo. During the final mixing of the track, Kenny Gamble impulsively reached over to the echo button and added echo to Jackson's opening riffs.
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