animate volume (fadein/ out)

Authoring SMIL 2.0 and trying to use the animate tag to fade in and out 
the sound of a single rm audio file.
Is there a limitation to the audio file type we can use as source in 
order for the fade work properly?
I am experiencing re-buffering and therefor stuttering audio during the 
fades (Realplayer 10).
I have used the code exactly as described in the real production guide. 
Even their own files provided for the code example are stuttering.
Any known issues with that?
thank you. 

Received on Tuesday, 14 June 2005 01:40:15 UTC