let me also say aside from simple NH work... as good as the Ketron Kbs sound & I have had many of them that is not always the best solution to the problem,.... for me anyway navigational features is the utmost importance when performing the way I do with lightning fast changes and jumping between styles, Mp3's, lyrics if needed, backing tracks etc, all in split second rapid fire succession between songs that cannot be achieved with only an arranger KB of any kind on the market today.
You have to use other gear to make it all come together somehow..