Hi Rumney,
You can also create registration to memorize the volume settings of your voice parts of a style. I usually create a bank of 10 registrations for each song in mind to memorize style and voice settings, with voice volume, voice choices, style choices, the associated style intro, variation, ending, etc. memorized by each of the 10 registrations inside the same registration bank. When playing different portions of a song, I press different registration buttons accordingly, instead of pressing other buttons, to simplify arranger controls, and concentrate on my fingers on the keyboard.
Thanks,
Paul