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MXR, also known as MXR Innovations, was a manufacturer of guitar effects units, founded in 1974 by Keith Barr, and Terry Sherwood, and based in Rochester, New York. MXR is now owned by Jim Dunlop. Under Jim Dunlop's ownership MXR continue both to make their classic FX such as the M101 Phase 90 and M102 Dyna Comp as well as release genre defining new  pedals like the M169 Carbon Copy.