Lee, I'm 75+ and have created hundreds of registrations - to me that was part of the fun of owning an arranger keyboard. All that was done on those registrations was to select a style, then select 8 different right hand voices, all of which are already in the keyboard. Keep in mind this person is an outstanding musician, and that's what really makes those registrations sound so wonderful - not the actual contents.
Good luck,
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)