mp4 is the ipod video format. What you need is something to convert flash video or .fla to mp3. I use Videora to convert fla to mp4, but I checked and it doesn't look like it does mp3. Sorry I can't help!
Unless you want the mp4, in which case, I'd be happy to convert it for you.
or if you want to download the file, I use www.keepvid.com to download it (it'll be an flv file) and Super to convert it, can be both audio and video, google to find it