playLoudness question

[Barry Levine]

Before I start tossing another custom property into my QT player 
object, let me ask this question:

When I use the player controller to set a volume (loudness), is there a 
way to remember that setting from launch to launch? Reading through the 
docs, it appears that I need to create a custom property for the player 
and store the numeric loudness setting there (zero through 100). If I 
"set the playLoudness" of a player to 50, for example, it does not 
appear to be saved even if I immediately save the stack.

Am I thinking along the correct lines?

Thanks,
Barry