The 'volume' property

Implemented under MacOS only

Scalar number in the range ¯1.0 to +1.0

Valid for: Movie

Set movie volume in range ¯1.0 to +1.0. Values between 1.0 and 0.0 cause sound to be reduced proportionately. Negative values mute the sound and can be used to stop the sound temporarily whilst retaining information about the volume previously chosen.