ESC

MXR is a Rochester, New York-based manufacturer of effects pedals, co-founded in 1972 by Keith Barr and Terry Sherwood and incorporated as MXR Innovations, Inc. in 1974. The MXR trademark is now owned by Jim Dunlop, which continues to produce the original effects units along with new additions to the line. [taken from: https://en.wikipedia.org/wiki/MXR]

LinksMXR homepage on Dunlop's site