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Tape echoes work by recording sound on a magnetic tape, which is then played back; the tape speed and distance between the recording and playback heads determine the delay time, while a feedback variable (where the delayed sound is fed back into the input) allows for multiple echoes. The predecessor of the Echoplex was a tape echo designed by Ray Butts in the 1950s, who built it into a guitar amplifier called the EchoSonic. Butts built fewer than seventy EchoSonics

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