The CD-DA Auto Play Mode places OtsAV into a special mode whereby it will automatically generate a playlist and begin playing an audio CD that is inserted in any of your CD-ROM drives.
You can see this feature in action by double-clicking on the OtsAV (CD Play) icon. If you have a CD in your CD-ROM drive OtsAV will generate a playlist and automatically play the generated playlist.
You are able to enable the CD-DA Auto Play Mode in a current session. Go to Options -> CD-DA and select the CD-DA Auto Play Mode. Place a CD in your CD-Rom drive and OtsAV will generate a playlist and automatically play the generated playlist.
For instructions on configuring an icon to auto-play a CD click here.