I may be the only one doing this live---but, I gig on a S910 with the auto rhythms (songs) already sequenced and stored on a USB drive. That frees up both hands for soloing, etc.. Works great in my situation. Played for 300 people tonight with a drummer and horn man. Worked like a charm.
Exactly Larry Styles, CS, SMF's are ALL just variations of SMF...
how you operate them is up to the player.