"Anyone else doing complete arrangements using the sequencer and storing on disk or card?"

Absolutely. ALL my work is original. I do original backing in the COMPOSER. On occasion, I have reworked a big band style in the keyboard to the point of it being my very own. I like NO styles in the keyboard because they just don't work in a professional sense. I'm sure many on the forum have fun playing along with them repetitiously playing in the background. Those 4 measures come around too often for me. Good for you that you have several KNs in your possession. You should have no trouble transferring your earlier work to the KN7000.

Scott