not to familiar with reaper, but i dont think u can rewire into it, u would pro tools, cubase, or just go get the record update for reasons users, if u have reason 5 (i do) i thought record came with it, check propellerheads website see if they can hook u up cause they did have a deal where they included record if u got the new reason, either way it makes trackin out real easy from the mp, hell i only use cubase now to master otherwise its all in record
I'm not a Reaper user but I wanted to point out that it actually can utilize ReWire just like most other computer DAW. So, when it comes to tracking everything out, Reaper will probably be your nerve center. Record the MPC as audio and ReWire Reason into Reaper. It's up to you to read up or find out how though.