ReWire Tutorial Article Sonar - Step 2: Routing MIDI
Via ReWire you are not limited to transmitting only audio from Reason to Sonar, you can also send MIDI from Sonar to Reason. This way you can control everything from Sonar - in effect, Reason becomes a rack of devices that you play from the Rewire host! Or, if you like, you can have Reason's sequencer play some of the devices and the sequencer in Sonar play some - it's up to you.
1. In Reason, create the device you want to play.
2. In Sonar, select the MIDI track in the ReWire folder track we created in step 1.
3. Pull down the CH drop down menu on the track inspector to the left and select the Reason device you want to transmit MIDI to. The output of the MIDI track is now routed to that device.
If you enter some MIDI notes on the track and hit play, you will hear them being played by this Reason instrument device. This works just as if each Reason device was a stand-alone hardware MIDI sound module.
You can also play Reason instruments "live" this way, by selecting the proper MIDI input for the track in Sonar (the input to which your MIDI keyboard is connected). All incoming MIDI is immediately sent to the track's MIDI Output - the Reason device.
Step 3: Using Multiple ReWire Channels