Akai ACVDS731UXT - Manual (Page 17)

Playing MP3 and Regular Audio CD
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Your MP3 files should be ISO 9660 or JOLIET format.
Valid MP3 CD
Play
In most cases, when a MP3 or audio disc is placed into the
player, the first song file of the first folder plays.
In other cases, the file manager appears. Use direction keys
( and ) to select the song file and press to play.