Pesky 'onSoundComplete'...grr

hiya,
in my movie theres a button which loads an external .swf into my main movie like in this tutorial:
http://www.kirupa.com/developer/mx/soundbar.htm

i have the preloader set-up and on the third frame lies my mp3.
its in my library as song1 and in the linkage it is called song1 and is set to export for actionscript.

how can i get flash to tell me wether the mp3 is finished playing?
is it possible at all when the mp3 is on a frame? :ponder:

the preloader jumps between frame 1 and 2 and checks wether bytes_loaded == bytes_total and then jumps to frame 3. and in the run scales a loader bar to 100%. (like in the tutorial above).

i want the movie to jump to another frame when the mp3 is through.
how should i proceed?

i fiddled about with onSoundComplete, but can’t get it to work the way it should. :puzzle:

any ideas are greatly appreciated.
thanks,
dual