Kahn uses percussion and analogue synthesizer, Mueller uses percussion and cassettes; both blur the realm of merely using percussion instruments as devices to be struck; as on their recent recording, "Supershells," they take the frequencies and textures of their instruments, and integrate them into one seemless mix; "Percussion is often subsumed within the densely swelling layers of electronic and manipulated sound...to a remarkable degree with the unstable, bottom-heavy, rather threatening electronic sounds which are characteristic of this impressive set." - Brian Marley, The Wire.