Tip for better audio:
soundName.loadSound("url", isStreaming)
soundName.getBytesLoaded()
soundName.getBytesTotal()
soundName.play()
isStreaming is a boolean expression(true/false), and sets how flash treats the sound file (streaming or event)
This code is the only the beginning for hosting sound files separately from the flash, see the actionscript section of your help files for loading sound files dynamically (search for "mp3")
I hope that helps, if you host a higher-quality music set elsewhere, you can drop the filesize on NG, and increase overall quality. I offer this help because you seem to have some web space of your own, and the audio is THE ONLY PART OF THIS FLASH THAT IS LACKING.
Seriously.
Aces all around. =]