How do you use Reference Tracks in Sonar? (Workflow)

I create a Reference Bus which is after my Master Bus. It's just a pass through to allow me to compare what's out of my Master Bus compared to reference tracks.

I get whatever reference tracks I need using the tool in this link.

https://www.samplemagic.com/details/184/magic-ab

I put this on the Reference Bus. When I'm not using it it's off and nothing effects the signal reaching the audio interface.

It's great!

I create 2 busses: Meters and Master, and the Master is fed into the Meters buss which goes to the hardware outs. On the Meters buss, I have various metering plugins so I can see what the audio is doing.
 
I run all of my project tracks to Master buss and put any effects I require on that.
 
Then I set up a track with the reference mix in it and set the out of that to the Meters buss directly.
 
I usually switch between them by soloing/muting the reference track.
 
Some caveats to keep in mind is the reference track is usually already mastered so you'll likely need to drop the output of that a fair but to match your project, unless you're running mastering effects on your Master buss already (it's actually sometimes a good idea to mix into a limiter so you can get an idea of what might change once your mix has been sent off to a mastering engineer and had compression applied, etc. - just remember to mix with the limiter off when you prepare the mix for mastering!)
 
There's probably better ways to do this stuff out there (see the post above for a good example) but I tend to find this is the most efficient for me.