Each track’s pattern could be played separately (in a looping kind of way) and ofcourse in sync with the rest. Veeeeeeery awesome for a live-situation. You can compare it to the Ableton-way of working…but better ofcourse. 
Very quick mockup to give the idea.
No idea how you’d be able to control, but just something I thought of after reading s-n-s’s topic about the Novation Launchpad.