If you have Sonar 2.0 or higher, Yes! It's easy - Here's how:

1. Launch Sonar.

2. Go to Insert - Rewire Device - Reason.

3. Launch Reason separately.

4. Load your Reason song within Reason.

5. You may use transport controls on either Reason or Sonar.

Sonar has now made an audio track for Reason so you can apply DirectX plugins and adjust level & pan. It has also created a Midi track for sending Midi info to any of the synths in Reason.

You can use up to 64 audio channels from Reason to Sonar by selecting Reason Inputs instead of actual Audio inputs.