In Reason, there is no known (to me anyway) way to "use" elsewhere recorded audio other than loading in the samplers. You also can't ADD audio tracks. What you CAN do is this:
- Get Cubase and hook Reason up (by Rewire).
- Use Cubase to record and handle audio.
- Import Reason's audio tracks to Cubase and be happy with the result
The two applications will playback simultaneously and preety much work as one.
Now, (From the Propellerheads web site - www.propellerheads.se)
"ReWire is a system for transferring audio data between two computer applications, in real time. Basically, you could view ReWire as an "invisible cable" that streams audio from one computer program into another."
The interconnection between Cubase and Reason is very very easy and won't trouble you one bit! You can find details on how to connect using Rewire at propellerheads.se.
Instead of Cubase you can use any other Rewire compatible sequencer program (like Sonar for instance). Choose what you like AND TRY BEFORE YOU BUY!
I hope that helped...