I see three solutions: 1. AAtranslator: converts whole projects, so you don't worry about anything. Haven't tried it, but I heard that it's decent soft. Cons: expensive: it costs 99$, so it's more expensive than discounted Reaper's license! Link: 2. MEAP. Costs half of AAtranslator and does half (even less) of the job ;). It's a tool for automatic exporting stems in Cubase 3/4/5. It get's the job done well. But then you have to import stems to Reaper. And at the end you have no MIDI clips, no automation, just pure stems. Link: 3. Manual export of tracks: stems for audio, MIDI file for MIDI. Most timeconsuming. But the price is a bargain: 0$! (unless you don't count this work as a cost)