If you want to record your X/Y pad movements, i guess you need to translate your OSC messages to midi messages defining two specific CC command for X and Y and bind those CC commands to the X and Y parameters respectively:
Duplex only seem to support live triggering here, not really broadcasting translated OSC messages to Midi message.
I did a similar thing once here:
http://forum.renoise…r-experimental/
It would however be better if Renoise would support mapping OSC parameters directly to controllers. (Either using the GlobalOSCActions config or with a similar mapping frame used for midi)