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Pullen was raised in Detroit, where he became interested in electronic music early in his life. He began working on the Detroit techno scene in 1990, studying with Derrick May and working with him on business ventures. He used the aliases Bango, Kosmik Messenger, X-Stacy and Silent Phase. Pullen's incorporation of house and garage with techno has been cited as an influence on later electronic artists.
Pullen's music direction was strongly inspired by Derrick May, Juan Atkins and Kevin Saunderson, collectively referred to as the Belleville Three. Derrick May directly mentored Pullen, helping refine his sound, production skills and overall work ethic. Other peers included the next generation of Detroit producers, including Carl Craig and Jeff Mills, though musically Pullen sought a medium between Craig's futurism and Mills' raw minimalism.
His album Today Is the Tomorrow You Were Promised Yesterday, released on Virgin imprint Science, meanwhile, departed from the Detroit sound in favour of jazz/funk grooves, prompting comparisons to the work of Herbie Hancock.