RD 700SX TONE SELECT category changeable?

[get-z]

Hello, is it possible to program an other sound to the TONE SELECT buttons?
For example: on the ORGAN button are only Organ sounds, can i put an Pad Sound to
this category?
My prob is : in a show the musician wants to change the sounds very quickly, so it would be great
to have the sounds on the TONE SELECT buttons. He wants to play 6 different pad sounds and 4
string sounds. Tx for help !!! Berni