My sum total of information about this release comes from the release itself (Eric Lunde, after all, practically bathes in obscurity). He here strays from his traditionally noisy musique concrète to instead present a pair of decidedly minimal pieces. 'Ambient' is apparently an almost straight field recording of the HVAC components pictured above, while 'Piezo' produces a metallic haze with wavering overtones that verges on the melodic (using the same source material as the former).