| The original chorusing effect was made by combining two reel-to-reel tape recorders, one being slightly out of sync with the other, whose power supply was connected to an oscillator. The subtle differences between their pitch, timbre and time would create the effect. This analog recording technique (later named ADT – Automatic Double-Tracking) had been developed in 1966 by Ken Townsend, a recording engineer who worked at EMI's Abbey Road Studios during that recording period of [[the Beatles]]. Instantly doubling the source during the recording process delivered a fuller, richer quality to the sound, and reduced the time of producing a song. <ref>{{cite Of Buckley and Beatles|url="https://ofbuckleyandbeatles.wordpress.com/2010/11/07/whats-that-sound-beatles-production-tricks-part-1-adt/"|title="What's That Sound? Beatles Production Tricks: Part 1. 'ADT'"}}</ref>
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