Im not sure how the cd's work, or why they do but I tell you sumthing - IM SO GLAD I HAVE THEM!!Every year I dread christmas cuz im usually running round like a headless chicken and then have attacks rite after christmas lunch.Not this year!! Still been busy, still had christmas dinner.. I even had a go on my sisters new dance mat!! (hours of fun) and I have been symptom free all day... Well ok maybe not totally.. I did get slight tummy pains after being on the dance mat for 2 hours but im sure most people would.. Im having the best christmas I have had in a long time.. I hope this finds you all well too..