I hope you don’t mind me chiming in here. But the way I would change voices live in a style is to press function key f1/2 then select one of the eight style tracks and then change the sound to what ever you want it to be. Make sure you are in single sound mode as opposed to sound preset mode.

I use a genesys pro so the procedure I just described may be different on the XP so I stand to be corrected on that.

P.S I am glad you are having time to get familiar with the xp and that everything worked out with you getting the right one. What about the physical quality of the xp? How are the buttons especially the Function keys and the wheel?