7 Ballas, J. 1992 Delivery of information through sound Kramer, G. SFI studies in the sciences of complexity Addison Wesley Longman See Kramer, G (ed) 1994. Auditory display: Sonification, Audification, and Auditory Interfaces. Santa Fe Institute Studies in the Sciences of Complexity, Proceedings, Volume XVIII. Reading, MA: Addison Wesley Publishing Company.