> I'm not an admin on the Moodle , unfortunately, so I can't see it
Oh I see. Sorry about that.
Another way to get the zip file would be to download a Moodle package to your PC, and unzip the whole of Moodle on your PC, and then locate the mediaplayer folder.
Alternatively, you could get the source file straight from the Moodle CVS depository here:
If you are confident experimenting with the Flash file source and can find a workaround, that would be marvelous. Otherwise, we could ask the creator of Moodle's mp3 player, Andrew Walker, for help.
all the best