Creating an MP3 Disc with A DVDr that will play in a MP3 player, or DVD player that supports MP3 discs. Anyone know how? I have a portable MP3 player that plays all my MP3 discs, and an APEX AD-1500 that does the same. But will not play MP3 Disc's burnt on DVDr, even though it reads DVDr discs. Any help appreciated.