LFO were a techno/ electronica act from Leeds, originally a duo comprised of Mark Bell and Gez Varley. Gez left in 1996 and Mark Bell passed away in 2014.
Their output from 1988 onwards has appeared on Warp Records, including the crossover-subbass track, "LFO", its parent-album "Frequencies" (1991) and subsequent albums "Advance" and "Sheath".