Passing NIL in speechInfo disables the text-done callback procedure. This selector works with the GetSpeechInfo function and does not move memory. The speechInfo parameter is a pointer to a variable of type Fixed . Volumes are expressed in fixed-point units ranging from 0.0 through 1.0. A value of 0.0 corresponds to silence, and a value of 1.0 corresponds to the maximum possible volume.
Volume units lie on a scale that is linear with amplitude or voltage.
A doubling of perceived loudness corresponds to a doubling of the volume. This selector worksme. This selector works with both the GetSpeechInfo and SetSpeechInfo functions and does not move memory. Passing NIL in speechInfo disables the word callback procedure. This selector works with the SetSpeechInfo function and does not move memory.