ORF musikprotokoll presents weiss/weisslich 27d: complementary noise, Peter Ablinger's puzzle games with twelve-tone scales: Visitors move in a circle of loudspeakers that lure them into an Escherian auditory spiral. The scales rise or fall seemingly endlessly, depending on which direction you go.

Ablinger's piece is dedicated to his partner in crime Winfried Ritsch. The reverse is also true: in this issue we juxtapose "weiss/weisslich 27d" with a piece that Ritsch wrote for Ablinger: "Gesang der Orgel 2b". In both cases, almost imperceptible changes in the vibrations challenge our hearing.

In another work, "Movement for Brass (Infringement)", Ablinger creates low-frequency vibration patterns on sheet brass - on the border between hearing and seeing, where sound becomes an artefact.