It is technically possible to do, but your mp3 would have to be extremely short for it to work with jj2. You can convert your mp3 into a wav file and then put the wav file into any of those file formats. Just remember that the new file you make will be about 3 times as large as the original mp3 and that jj2 can only handle small music files, I don't know an exact limit, but I'd guess you can't have over a minute of music.