From VRML 2 Basic Concepts and Definitions CPS616 -- Information Track of CPS -- Spring Semester 98. byZeynep Ozdemir, Rob Baker, Meryem Ispirli, Geoffrey C. Fox
Adding sound to the VRML world involves two components: the sound source and the sound emitter.
The sound source provides a sound signal. The sound emitter turns the source's signal into sound that the audience can hear.
AudioClip and MovieTexture nodes provide the sound source component.