This one...
http://www.youtube.com/watch?v=LVQ1SwSJ3YA
 

razor
Thanks all. I saw a YouTube video on how to set it up and it wasn't real clear, but it looked like (maybe) a separate fx like reverb was being fed into the side chain of Channel Tool.
 
If that's not right, I guess the only way to add reverb in this setting is a reverb plug that has M/S functionality. Is that right?

I don't think so.  If you are really doing mid-side recording, you have to run that through the MS matrix before using any other effects, I believe.  If you tamper with either of the channels before matrixing, I don't think you will get a proper stereo signal out of the matrix.
 
There are times that the side channel by itself might be useful.  If you are just looking to add some ambiance to the sound, you might do the normal M-S matrixing to create the stereo channel, but also clone the side channel and process that to add ambiance.

You can't process the mid and side elements separately within Channel tools, other than gain, but you can use that to create separate mid and side busses for separate processing. This is covered in detail in the Sonar X2 Advanced Workshop FX video but basically (using your guitar scenario).
 

1. Create 3 busses. One called "Guitar Buss", One "Mid Buss", the other "Side Buss"
2. Set the track outputs (The ones you want to process) to the "Guitar Buss".
3. Set the guitar buss output to "none", and insert two sends one to the mid buss the other to the side buss.
4. Set Mid and Side buss outputs to your master buss
5. Insert channel tools on both the "Mid" and "Side" busses
6. Make sure that the input mode of channel tools on both are "Stereo"
7. On the Mid Buss reduce "Side Gain" in Channel Tools completely
8. On the Side Buss reduce "Mid Gain" completely
9. You now have two busses, one that only plays the "Mid" content, the other the "Side" content. Add processers to these busses and use their faders to control levels as you see fit to process each element separately
10. That's it.

 
I have seen some really complicated set ups suggested with channel tools including send pans, re-encoding busses, etc but there's no need to do that as channel tools takes care of the hard work. The complex buss set up is only needed to perform the mid/side extraction without channel tools.

FastBikerBoy
You can't process the mid and side elements separately within Channel tools, other than gain, but you can use that to create separate mid and side busses for separate processing. This is covered in detail in the Sonar X2 Advanced Workshop FX video but basically (using your guitar scenario).
 

1. Create 3 busses. One called "Guitar Buss", One "Mid Buss", the other "Side Buss"
2. Set the track outputs (The ones you want to process) to the "Guitar Buss".
3. Set the guitar buss output to "none", and insert two sends one to the mid buss the other to the side buss.
4. Set Mid and Side buss outputs to your master buss
5. Insert channel tools on both the "Mid" and "Side" busses
6. Make sure that the input mode of channel tools on both are "Stereo"
7. On the Mid Buss reduce "Side Gain" in Channel Tools completely
8. On the Side Buss reduce "Mid Gain" completely
9. You now have two busses, one that only plays the "Mid" content, the other the "Side" content. Add processers to these busses and use their faders to control levels as you see fit to process each element separately
10. That's it.

 
I have seen some really complicated set ups suggested with channel tools including send pans, re-encoding busses, etc but there's no need to do that as channel tools takes care of the hard work. The complex buss set up is only needed to perform the mid/side extraction without channel tools.

Thank you FBB.  Another super helpful breakdown.  Gonna go try this right now...

A combination of a short delay and different EQ curves seems to work for me. One thing you can do is EQ each side with a curve that's the approximate opposite of the other side, ie what you boost on one side, cut on the other. Subtle boosts and cuts are enough to create a stereo difference without changing the character of the instrument too much (I use shelves). Some EQ's let you process left and right with separate curves, like the Waves ones, meaning you can do it with one EQ on a bus.

Thanks for all of the How-To's. That's exactly what I needed. I like an A) B) C) approach when I do something for the first time.
 
The mixing/mastering books did say something about complimentary EQ cut/boosts on each channel to enhance the stereo sensation.
 
I can hardly wait to try this. I am also trying to get this and future projects more mono-ready and this will help there too.
 

Razor, Craig Anderton says he always mixes mono until he has his EQs pretty dialed in. He adjusts levels and EQ settings until everything can be heard fairly well in mono. Then he spreads it.