I'm in the same position as you...did you ever get Reaper to work with the R16 ? I've had a lot of trouble in configuring it as a working control surface.
Ray
I guess I'm in the same boat as everyone else who bought the Zoom R16. I need help in setting it up to work as an interface and control surface. I'm using Windows XP.
UPDATE:
I got my ZOOM R16 last Thursday. I spent most of Saturday trying to configure it to work in interface and control surface mode. Nothing seemed to work. I even thought about sending it back for credit. This mornimg I called SamsonTech and spoke with a support technician who is somewhat familiar with REAPER. I explained the steps I had taken. He walked me through the setup and now everything works. YIPPEEEEE!!!!!