Programming Reference:AudioStimulus Class
string Sound (rw)
A name of a sound file, or a text to speak. When enclosed with single quotes, the string is interpreted as a text to speak.
float Volume (rw)
A number between 0 and 1, representing the volume of audio output.
Renders the text given by the Sound property using the system-wide text-to-speech engine, or begins playback of the sound file specified there.