I think your right, my understanding is that I really need the B&O CD Changer box Type 5103 to make it all work
http://img515.imageshack.us/img515/5673/bocdchangertype5103.jpg
What Sony 10 CD Changers work with the 5103 box, is it a specific American model, or will any Sony changers from the nineties work with the B&O 5103 control box ???