The background is that Matmos trapped a rat in their apartment using a “have-a-heart” (non-lethal) trap. Track 1 is “an unedited recording of the rat protesting its incarceration.” Thus, 14 minutes of occasional squealing, some rattling of the metal cage, and a lot of void that your listeners will be hard pressed to distinguish from dead air. An acquired taste but not good radio by itself. On the other hand, certainly something out of the ordinary. Track 2 “remixes” track 1 by preserving the “timing and duration of the rat screams from the first track” while adding Matmos-esque explosions of extremely-closely-recorded god-knows-what, causing you to tear your hair out trying to set the board level. Perversely, a Can-like bass groove in the seventh minute, followed at random-ish intervals by further musical interludes. No doubt there’s more to it than I can hear or detect, given Matmos’ high concept approach to sound but that’s all you’re getting out of me on this one.