Joseph Raymond Butts 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. Most notably, Butts is the inventor of the EchoSonic, a guitar amplifier with a built-in tape echo, and the Filter'Tron, one of the first humbucker guitar pickups. He was active in other fields from studio equipment maintenance to sound engineering, and had intimate working relationships with people such as Sam Phillips at Sun Studios and Chet Atkins.