XeroFox (Formerly LeftCtrl, aka PolyGroovers, real name Konstantin Gredeskoul), is a DJ and a producer hailing from San Francisco, who;'s been DJ-ing and rocking underground events since 1998 from Melbourne Australia, across USA, and in Spain, Greece and England.

XerFox previous production acts include the downtempo duo PolyGroovers, with two albums on iTunes.

During the day Konstantin works as software wizard, ex-CTO, and a prolific open source contributor

LeftCtrl has been DJ-ing since 1998, starting out as an underground DJ in the SF Bay Area, inspired by Friends and Family and CloudFactory collectives. At the time techno was the speak of the night, but most recently, LeftCtrl is leaning on groovy deep house tracks, with strong spanish, latin american or 1920s swing influences, intermixed and interleaved with hypnotic beats, signature of deep tech-house.