Dave, here is a link to an article I wrote a decade ago pertaining registrations. Much of the information is still good with today's newer keyboards. It's a step by step guide that will help you understand what they do and how to create them.
https://www.psrtutorial.com/lessons/playing/regist/10regGD.htmlHope this helps,
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.)