one neat thing about the CP5 is that it has five zones with knobs and on off buttons - of course that is for the internal sounds (4) and a mic - I have not tried to use it as a midi controller, this is my live performing board. However having the four knobs to adjust the level of the splits and layers is very useful.
I want to know if the music rack I had to buy separately for the CP5 will fit the CP4. And honestly why isn't the music rack included on all models, I mean come on.