Ok I have put a blank usb in and exported all my files and Rekordbox does export the key data. BUT, if I have a USB device which I have used before with tracks and playlists already on and I have uadated the tracks by analyzing the key data, the key data dos not export.
So I have to delete all my tracks from USB device before exporting, this takes ages though as the devce has to rewrite al of the tracks, can this really be right??