Fran, Diki agrees with me (and what higher authority is there?) On Rolands, anyway.
http://roland-arranger.com/index.php?option=com_smf&Itemid=38&topic=433.0
http://roland-arranger.com/index.php?option=com_smf&Itemid=38&topic=1165.0
http://www.synthzone.com/ubbs/Forum37/HTML/019994.html

This comes up with orchestral music, film scores, traditional liturgical music, etc. where there are a lot of sustained pad-type sounds, changes in the time signature, or when you just need to play rubato.

The T3 style "Ethereal Movie" that everyone was talking about a few months ago would be an example of this. When I first got my E-50 I tried very hard to make a style like this. I succeeded (sort-of), but the results were dependent on which voice I used. (See my original post on roland-arranger.com)

Please look at the manuals. Yamaha's Style File Format (SFF) going all the way back to the 1997 PSR-730, has a lot more parameters in the style creation section to determine what the machine will do to your original source pattern. Most of the time you will not need all of them (and some of them I will probably NEVER use!) Korg added some new options in this area starting with the PA-800, and might be the best as of now.

Yamaha can give you more than the obvious 15 patterns per style. But if you want different patterns for major and minor chords for example, you have to use a 3rd party tool (CASM editor) to access that part of the style file.

O/T- Fran will you be playing anywhere near the Jersey Shore in July?
Thanks,
Ted