Geeze guys, this is why there are so many great features in today's arranger keyboards, features that allow you to set things up for any particular song. Most of this, however, has already been done, mainly in the form of the style itself using variations. Usually, the first variation (A) has the least amount of backing and increases as you select higher levels of variation - not a big deal.
However, if you need more, then registrations are the way to go, which allows up to 8 levels that you can custom make to fit that specific song - again, not at all complicated, but it does take some time and effort in order to construct them.
In my case, I used the Music Finder Directory, which is nothing more than a miniature version of a registration. While the MFD is limited to some degree, it also allowed me to seamlessly go from one song to the next with the touch of a single button. Additionally, it pretty much eliminated dead time between songs. As a live player, with a dance floor filled to capacity, this was a great tool offered by Yamaha until the SX-900 arrived, at which point it was replaced by their song book, which is a bit more cumbersome, at least from my limited experience with that model. That said, I'm confident there is some sort of workaround that could be implemented to overcome this, but I really don't have to worry because I'm hanging on to my S-950 till my untimely demise.
For home players, none of this really makes any difference - you don't need to rapidly select a song on the fly to keep a dance floor filled or to please an audience - you are the audience!

You can spend all the time you wish setting up a song, then save it to a registration, which can always be modified at a later date.
Good luck,
Gary
