Hello

Although I have not looked at the S900 manual, I believe that what you are describing is a great new feature that I discovered the hard way, live at an important gig with a quartet I was playing with.

On the Tyros 2 I found at first that if I went from one style to another that it would change speeds to the default.

On investigating I found the following, whic I suspect is what you now have:

Function>Style Setting>Style Change Behavior

Then set Tempo Hold/Reset.

You may also have Part On/Off, which allows me to turn off different parts of the style and those parts stay turned off as you go from one style to the other both with and without stopping in between.

As far as styles only being used at or about at the default speed is not totally using your kb with the most options. I have found you can take a lot of styles and set them for dramatically different speeds and it sounds great. The intros and endings may not sound right, but the varitations can really work out at even radical changes like very fast to medium to slow. Test it out. If you're not doing it you're missing a lot on your kb.

Best
Scott www.ScottLMusic.com