I know you made this post a week ago, but the standard/base CD player does NOT play mp3 files on a CD. The radio will play them through the aux-jack only.Silverfox said:The standard CD player will play MP3/WMA. It also as the auxiliary jack. The second level CD player has a six disc in-dash changer and MP3/WMA capabilities, but no auxiliary jack. The third level player adds the tape deck.