The Beatles' producer George Martin has disputed this "reel flange" source, attributing the term to John Lennon instead. By pressing a finger on the flange of the other deck, the effect sweeps back in the other direction as the decks progress towards being in sync. The "drainpipe" or subtle "swoosh" 'flange flango' effect "sweeps" in one direction, and the playback of that recorder remains slightly behind the other when the finger is removed. The engineer slows down one playback recorder by lightly pressing a finger on the flange (rim) of the supply reel.
The output from the two recorders is mixed to a third recorder. The finished music track is recorded simultaneously to two matching tape machines, then replayed with both decks in sync. The term "flanging" comes from one of the early methods of producing the effect. As an audio effect, a listener hears a "drainpipe" or "swoosh" or "jet plane" sweeping effect as shifting sum-and-difference harmonics are created analogous to use of a variable notch filter.
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