Fred Welton Warmsley III (born September 22, 1987), known professionally as Dedekind Cut (formerly Lee Bannon), is an American record producer and sound artist from Sacramento, California.

Initially known for his work with the New York-based hip hop collective Pro Era, he has since been known for producing in multiple genres including breakcore, ambient and noise music, releasing eight extended plays and two long plays since 2013, including the critically acclaimed Alternate/Endings.

His debut studio album under the name Dedekind Cut, entitled $uccessor, was released on November 11, 2016.

On January 15, 2018 under the alias of Barrio Sur, he released बड़ा शोक (heart break), a rock-oriented mixtape that was previously recorded in the summer of 2017.