This is what decided to use on my Sx900 Regs.
Reg 1-Select the song and style.
Reg 2 through 8 --- changing volumes, Variations, instruments, delete parts of the Accomp. and sometimes changing to another style that complements the first one to add another feel; fantastic for Latin music.
Another quick fix is the dedicated Arranger Mute knobs - A, and B. You can filter out parts of a style while it's playing.