Moffat also contributes vocals to the Mogwai song Now You're Taken from 4 Satin.
EP+6 brings together all three of Mogwai's previous EPs: 1997's 4 Satin, 1998's No Education = No Future (Fuck the Curfew), and 1999's EP, in a Remastered and Enhanced CD, featuring the music video for "Stanley Kubrick".
12 features three songs, "Untitled", "Quiet Stereo Dee" (an alternate version of "Stereodee" from 4 Satin, the 1997 EP), and "Arundel" (a cover of a Papa M song from the 1999 album, Live from a Shark Cage), all recorded at Sub Station Studio in Cowdenbeath, Scotland in 1999, and produced by Michael Brennan Jr. and Kevin Lynch.