Name-checking a diverse cast of progenitors including Varése, Xenakis, and Robert Moog, as well as Can and Stereolab, Add N to X are electro-historians of a sort, collectors of vintage synthesizer technology, and fierce propagators of the man-machine aesthetic (the cover of their second album features member Ann Shenton on the operating table with a synthesizer either being inserted or taken out of her organ cavity). The trio formed when Shenton met Barry Smith in 1993; both were fans of vintage synth and the proto-electronica crafted in the 1960s and '70s by such luminaries a...