Just backed out CDDA support. Don't enjoy. It was causing The Apprentice to play nice CDDA on its game intro screen, but at the same time it also didn't progress past the first frame of the game intro screen.
Keep in mind that enabling CDDA breaks some Konami PSX based games too, IIRC Beat The Champ and the other one on that hardware. If you turn off 'Music' in test mode they play, if you enable music they just report never ending disc / load errors. It could be something broken somewhere else in MAMEs CD code when it comes to handling CDDA and it also requires other access to the disc?