Send tape echo echo delay
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Send tape echo echo delay (more commonly known as STEED, alternatively known as single tape echo and echo delay[1][2]) is a technique used in magnetic tape sound recording to apply a delay effect using tape loops and echo chambers.
In 2006, while publicising his memoir (Here, There, and Everywhere: My Life Recording the Music of The Beatles), recording engineer Geoff Emerick stated that "God only knows" how the effect worked.[3]