Jeff Dunmire is an excellent demo player, but I found it somewhat odd he didn't demo, at all, utilizing any accompaniments(styles)
...speaking of...

Yamaha has tons of custom styles, sounds, registrations, etc. readily available in many places, both free, and paid. It's one reason Yamaha arrangers are #1.

Does anyone know if Casio offers any custom styles, patches, etc.? And are there any Casio forums, groups, or similar where user styles and files(accompaniments)can be shared?

Finally, are styles, registrations, sound patches, etc. from past Casio arranger workstations compatible with the 7500?

Yes I'm thinking of buying one...