Butts's tape-loop technology was the basis for the later Echoplex, which he hadn't patented, but he received a "nominal sum" from the manufacturers.
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Joseph Raymond "Ray" Butts (September 22, 1919 - April 20, 2003), in Ethel, Mississippi) was an American inventor and engineer best known for designing several devices that influenced the evolution of electrified music, in particular those used with the electric guitar.
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