Hi Santa,
I think your kn1000 composer styles have to be converted first with the style conversion disk before they'll load. As for panel memory, sequencer & sounds , I can't comment.

As for the kn2000 styles they should load ( there are updated versions of these styles on the http://www.technicskn7000.com/home.asp but they are in custom format not in composer format.
I don't really do sequencing of songs, so again I can't really comment .

If you still have access to the kn1000/2000 the only true reproduction to the original would be as an audio file ( mp3). The mp3 can then be played in the kn7.

The kn7 has far better sounds etc than the kn1000/2000 did,so with tweaking your arrangements should end up sounding better in the long run.

Sorry , I can't be much help

best wishes
Rikki