STYLE PARTS - Creating a STYLE from scratch
Not something I would particularly want to do as there are so many existing STYLES for you to choose from. And you would have to know in your head what it was you were wanting to 'create'. I would normally start with an existing STYLE and add into it something specific I wanted to hear .. like an arpeggio, or a repeating piano. But it's interesting to watch what he does here as you can pick up the basics behind using the STYLE CREATOR program.
CREATING STYLES - TUTORIAL FOR ALL YAMAHA ARRANGER KEYBOARDS ; TYROS AND PSR-S SERIES