... 19.1 Introduction to aural style sheets . ... Style sheet properties for aural presentation may be used together with visual properties (mixed media) or as an aural alternative to visual presentation. ... When using aural properties, the canvas consists of a three-dimensional physical space (sound surrounds) and a temporal space (one may specify sounds before, during, and after other sounds). ... Value: . ... refer to inherited value . ... If only one value is given, it applies to both properties. ...