Technical Q&A's
QTMTB 39 - Functions that Modify Movie Properties, QuickTime Track, and Movie Sound Volume (1-May-95)
Q What do the values of a movie's or track's volume represent? Is
there no way to make a track louder?
A The volume is described as a small fract 8:8 and its values go from -1 to 1
with negative values as place holders. The maximum volume you can get is 0x0100
with the minimum being 0 (or any negative value). The advantage of using
negative volumes is that you can turn off sound while maintaining the level of
volume. For example, -1 and 0 both equate to no volume, but the -1 implies that
1 should be the volume when sound is turned back on, whereas the 0 does not.
The volume for a track is scaled to the movie's volume, and the movie's volume
is scaled to the value the user specifies for the speaker volume using the
Sound control panel. This means that the movie volume represents the maximum
loudness of any track in the movie.
Note that starting with Sound Manager 3.0 you are able to increase the
loudness above the maximum level using the shift key.
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