Jonty Harrison is director of BEAST (Birmingham ElectroAcoustic Sound Theatre) and has worked with GRM and Ircam. His pieces appear on both sides of what he calls the “Schaeffer/Schafer division” — acousmatic music wich abstracts musical data from sound objects “without reference to their provenance in any anecdotal way” (as representd by Pierre Schaeffer) and soundscapes wich use natural sound art rather than purely musically (Canadian composer R Murray Schafer). Klang is an engaging example of the former, wich creates abstract structures with sounds from casserole dishes ground together. Sorties, in contrast, is a soundscape of door-slamming and other exits. Other pieces oscillates between the two approaches in what is a rewarding survey.