Thanks to all the people that have answered. The unit the I oredered will have the optional mp3 board installed. The reason I am asking this is because I own a fairly large collection of cdg +mp3 files. I would like to use most of the files and usa the arranger with a lead instruments and at the same time , synchronize the text for karaoke singing. Of course that I understand that with .kar files that can be done . However as you all know the cdg+mp3 files have additional advantages. Like background vocals and sometimes better sounding instruments than what midi brings. Additionaly, many midi files take advantage of vsti conversion and I think it would be nice to play them after conversion with associated text file. Finally (and please excuse my extending) I am eager to try out the new Melodyne Direct Note access and see if there is the option to "mute" leading vocals from an .mp3 or .wav file (or leading notes as a matter of fact). If so...potentially ... it would mean that any .wav or .mp3 song would serve as a "background track" for one to play and sing along. Thanks for your patience.