Aside from the features of the new E3 controller box (DKC-800 or DKC-850), does anyone know if the current model of E3 pianos have features not found on the latest Mark III pianos? ie., are there additional or newer type electronics in the piano itself that interfaces to the E3 controller box that are not found on the older Mark III? In other words, I know that installing a DKC-850 controller to a Mark III equipped piano will bring the piano to E3 standards. I'm just wondering if there are newer electronics aboard the E3, with the exception of the E3 controller box?