You can't. You can work on the first 16 then copy them to the next 3 sets of 16, but that is all. It can be a bit annoying if you want to punch-in some notes as playing along will overwrite the previously recorded notes; you have to try to come in on the first beat of the 16 you want to record (or program). Oh well, it's meant I needed to get better at playing to get it right the first time. My finger drumming has become better as a result, so really the lack of focused loops has increased my skills in an area.