Caught this video of Teenage Engineering using the OP-1 as a control surface for Reason on Koshdukai's Music(al) Reason(ing) Blog, which has a ton more info on using the OP-1 with Reason - if you're lucky enough to own both ;-). Check out the functions:
"Teenage Engineering OP-1 meets Propellerheads Reason in a very short demo of the OP-1 / Reason control surface functionality.
Working with Reason 6.0.2, OP-1 OS #12234 and newer." -Teenage Engineering