12 Title Compilation Disc Layout Track Timing    The disc must contain 12 tracks (1 through 12) with 5 minutes of audio per track. Additional tracks may be added at the tail end of the disc for other purposes (test tones, instructions, etc.).    It is recommended to have a track 13 with at least 1 minute of audio to eliminate the possibility of having some playback devices stop playing after reaching the end of track 12.