Dear Ted,
Perhaps a little away from the technical side of things, I changed from the KN6000 to the KN7000 very recently, from my point of view I initially found that I questioned my decision to change.
I am now completely sold on the new keyboard, the regulars in the small Irish pub I am resident in at weekends have all commented on the sound of the KN7000, for some reason it appears to be a more mellow sound than the 6000 and more pleasing on the ear, a lot of my drum and bass tracks are on midi, I find the new SD card very, very fast to access now that I've got used to it, I no longer feel the need to use floppy's. The ability to record the keyboard and audio through my computer set up is, for me, a great asset, I've already made my first recordings and burned, by request, a few copies for those who have asked for them, the quality is superb, the recording that is!.
I have had the KN3000, 5000 and 6000 and can honestly say that the KN7000 is most certainly well worth having a look at, just give yourself a bit of time with it and it will grow on you.. sincere regards from the Emerald Isle..
Alan