Hello I'm a 44 y.o. musician from Copenhagen Denmark. I'm playing keys and singing in a various party bands. I've recently bourght a Casio WK6500 and i'm very satisfied with the product. However I've got one problem that I can't work out and I'm hoping someone here can help. I can't change the tone for the UPPER1 (right hand lead sound) while playing in split-mode. When i aply the split I can only acces the lower tone. I have to exit split-mode, change the upper sound and enable keysplit again. However this really anoing durring performance because I need to keep the basline going. I've consulted the manual without any luck.