Hi Eddie,
you don't have to switch between multiple modes when playing a live gig: You can also memorize Audio files to Registrations, exactly like memorizing Voices, Styles, Multi Pads or MIDI files to Registrations.
Use one complete Reg Bank per song title, even if you should need only one Registration in a Bank. Use the name of the song also as name of the Reg file. Then you can always stay in Reg mode.
If desired, you can also organize your Registrations in PLAYLISTS, of course. Then you can stay in the Playlist mode all the time when on gig.
Best regards,
Chris