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Simon Massey was a member of a three-piece group called Trench, on bass, vocals and electronics, who played in [a=Martin Russell] and [a=Simon Emmerson]'s Sonic Innovation #1 studio in the 90s. Mass and [a=Leigh Griffiths], the other permanent member of Trench who played guitar, later worked on a studio-based project, The Pigmies. In the end The Pigmies tracks were released under the names ECT & Mass.
Simon Massey also did a lot of freelance engineering and production and stayed in contact with Martin Russell. Russell brought him on board with the [a=Afro Celt Sound System] after the release of "Volume 2". Since then, he has continued to work with Simon Emmerson on a number of projects.