Hi --
Thanks for the quick feedback! I'm glad that your brother is enjoying his new keyboard. Proves there is a niche for instruments with a simplified user interface. Some people are turned off by all the buttons, options and whatnot.
According to the P-S500 Parameter Chart in the Data List, there might/should be a way to change from AI full keyboard to fingered, etc. Maybe through the Smart Pianist app?
That darned Smart Pianist app is incredibly uninformative if it isn't connected to a Yamaha keyboard that it recognizes. Makes it hard to figure out what is possible. The S500 downloads page has a PDF called "Smart Pianist Specifications". It shows the specific Smart Pianist features supported by specific Yamaha keyboards. The chart is missing important info; the "Style" feature is only one line and no details!
I wonder if Smart Pianist will eventually support adding new styles to the CSPs and S500?
Yeah, that 2 line by 16 character display must be like looking through a keyhole. Reminds me of editing voices on the 1990's TG-500 module.
Take care -- pj