Here is how my DVD Audio player's manual describes it: Some DVD Audio discs contain a special group called "bonus group" whose contents are not opened to the public. When loading a disc with a bonus group, "BONUS" indicator lights in the display window. The bonus group is always assigned to the last group of a disc (for example, if a disc contains four groups including a bonus group, "group 4" is the bonus group.) To playback a bonus group, you have to enter the specific password for the bonus group. A way of getting the password depends on discs. After getting the password, you can playback the bonus group by the following procedure.
While a disc containing a bonus group is stopped, select the bonus group number using the numeric buttons. The display window and on-screen display prompt you to enter the password as shown: KEY _ _ _ _
If you enter the password correctly, the unit starts playback of the bonus group.
I hope this helps explain the Steely Dan problem I'm having. It has a BONUS group but I can't find the password anywhere. HELP!!!!!!!!!!!!