Can't you create the loops in sonar and then rewire reason with Sonar and transfer the tracks to Sonar ?
I haven't worked with Reason in a while, but I recall performing rwiring certain parts I wanted.
Taken from the Reason Site Sonar Versions This description is based on Sonar version 2.0 and up for Windows. Sonar
Launching and quitting When using ReWire, the order in which you launch and quit the two programs is very important:
1. First launch Sonar.
2. Insert a Reason Device from the Insert menu.
See "Activating ReWire channels" below for details.
3. Launch Reason.
It may take slightly longer for Reason to start when you are using ReWire.
Depending on the operating system and your setup, you may get a warning saying that the MIDI inputs couldn’t be opened. This has nothing to do with ReWire in itself, it’s just that the mixer application may have “grabbed†the MIDI interface already. Since you can route MIDI to Reason via ReWire, this is not a problem. Simply click OK to continue the launch.
When you are finished, you also need to quit the applications in a special order:
1. First quit Reason.
2. Then quit Sonar.
Routing Audio Activating ReWire channels
ReWire2 supports 256 audio channels. Reason has 64 audio channels available. In Sonar, you can specify which of the available channels you want to use:
1. Pull down the Insert menu and select Reason from the ReWire Device sub-menu.
You can set the following options in the dialog:
Create MIDI Source Track
If ticked, this option will create a new MIDI track named "Reason".
First Synth Output
If ticked, this option will create a new audio track that uses the first output of Reason as the input. This would select Reason's Mix L&R outputs for the new track.
All Synths Outputs
This options automatically creates audio tracks for each ReWire channel available in Reason, and sets the input for each track to the corresponding channel.
You also have the option of opening Reason from within Sonar by checking the "Synth Property Page" box in the dialog.
By doing so, Reason will launch when you click OK in the dialog.
2. When you have finished making settings in the dialog, click OK.
Whatever options you set in the dialog, you have now activated Reason as a ReWire device in Sonar.
3. Launch Reason if you didn't select to launch it in the previous dialog.
4. If you now open the "In" pop-up for an audio track, the ReWire application will now be available on the menu, with the application's ReWire channels listed on the sub-menu.
Selecting a channel will direct the output from the synth application to the selected track. Repeat this step for all the ReWire channels you wish to use in Sonar.
How the ReWire channels are handled in Sonar
When you activate ReWire channels for audio tracks in Sonar, they will become available as channel strips in the Sonar Console. ReWire channels have the same functionality as regular audio channels. This means you can set volume and pan, add Send Effects etc.
Preparations for routing audio from Reason
When you route audio from Reason to Sonar, you make use of the Hardware Interface at the top of the rack. Basically, each output in the Hardware Interface is connected to a separate ReWire channel. Therefore:
To take full advantage of the mixing features in Sonar you need to connect the different Reason devices directly to the Hardware Interface.
For example, if your Reason Song contains eight different instrument devices and you connect these to separate inputs on the Hardware Interface, they will appear on separate ReWire channels in Sonar. You can then use the mixing facilities in Sonar to adjust volume and pan, add effects and equalizing etc. - individually for each Reason device!
If you instead connect all your Reason devices via a Mixer to the stereo input pair on the Hardware Interface, all sounds will appear mixed on a single ReWire stereo channel pair. While this works perfectly fine, you won't be able to mix and process the devices separately in Sonar.
Using the transport and tempo controls When you run ReWire, the transports in the two programs are completely linked. It doesn't matter in which program you Play, Stop, Fast Forward or Rewind. However, recording is still completely separate in the two applications.
Loop settings The Loop in Reason will be completely linked to the loop set in Sonar. This means that you can move the start and end point for the loop or turn the loop on or off in either program, and this will be reflected in the other.
Tempo settings As far as tempo goes, Sonar is always the Master. This means that both programs will run in the tempo set in Sonar.
However, if the project you are working with in Sonar does not incorporate any programmed tempo changes, you can adjust the tempo in either program, and this will immediately be reflected in the other.
Routing MIDI via ReWire2 Reason will automatically appear on the MIDI Output pop-up menus for MIDI tracks in Sonar. If you select Reason as the MIDI output the separate channels will be available on the MIDI "Ch" menu. This allows you to play Reason devices via MIDI from Sonar, using it as one or several separate MIDI sound sources.
An example - routing MIDI to Reason The following description shows how to direct MIDI to devices in Reason using Sonar as the host application:
1. In Sonar, select a MIDI track that you want to route to a device in Reason.
2. Pull down the MIDI Output menu for the track, and select Reason.
3. Select a Reason device from the "Ch" pop-up menu.
The output of the MIDI track is now routed to that device.
If you now play back a MIDI part on the track, the MIDI notes will be sent to the Reason device - just as if the track were connected to any regular MIDI sound source.
The sound of the device will be sent back into Sonar via ReWire - which channel it will appear on depends on how you have routed the device to the Hardware Interface in Reason, as discussed above.
Due to the way ReWire has been implemented in Sonar, a maximum of 16 Reason MIDI outputs are available. This means that only the first 16 Reason devices - in the order they were created - will be available on Sonar's MIDI Output menu.
Rendering Audio
Most often, there is no need to convert individual ReWire channels to regular audio tracks! The channels already appear in the host application's Mixer, and you can typically perform the same kind of real-time processing as with regular audio channels (effects, EQ, volume, pan and mute automation, etc.).
Still, you may need to convert the ReWire channels to audio tracks, for example if you want to continue working in Sonar only, or simply to mix down all tracks including any ReWire channels to a single file. To render ReWire channels to audio tracks in Sonar, you would proceed as follows:
1. Make sure your synthesizer application plays back properly via ReWire.
2. In Sonar, mute all tracks that you don't wish to bounce down (render) to an audio file.
When you play back you should only hear the ReWire channel(s), including any effects and/or processing added in Sonar. What you hear is exactly what you will get in the resulting file.
Note that if you unmute all ReWire channels, you will not be able to process these channels individually using the file produced by the Bounce operation.
This is not a problem if the objective is to capture the total sound played back via the ReWire channels. But if you wish to preserve the individual ReWire channels instead of mixing them down to a single file, you can perform a bounce separately for each individual ReWire channel.
3. Pull down the Edit menu in Sonar and select "Bounce to Track(s)" from the Export submenu.
The Bounce to Track(s) dialog appears, where you can choose a destination track and file format. The destination track can be an existing track or a new (automatically created) track
4. Activate (tick) all the "Mix Enables" options.
5. Click OK.
The resulting file will appear on the audio track selected in the Bounce to Track(s) dialog
6. Before playing back the new file, mute the original track(s) playing the ReWire channels.
If you now play back the audio track you will hear exactly what was played on the ReWire channel.
This means you should keep the ReWire channels muted (or deactivated) now, since otherwise you would hear the sound twice - once via ReWire and once from the audio track.
Converting ReWire channels this way results in a number of audio files that can be very large (depending on the length of the song). Make sure you have enough disk space!