Yeah I also came here to post about the idea of a true duophonic mode.. really would open up some fun sound design. You could even send them through separate filters. Makes me think they could have a regular duophonic and a highnote osc 1,2 low note osc 3,4 duo mode so you could almost treat it like a mulitimbrel bass note and lead type set up. There might be some complications for playing single notes though..