I had thought it was the FX bus, and as I use Sonar's console and the reverb set for the song, just hadn't routed it, but seems to be a submix bus. From the manual
 
The Bus Channel
A   commonly   used   “trick”   in   drum   mixing   is   to   create   a   submix   of   chosen   kit   elements  
(kick+snare+hihat for example), distort or heavily compress this submix, and then introduce this back
into the main mix at a lower level.
The result  is  that  you  get  the  dynamics  and  punch  of  the  “normal”  cleaner  main  mix,  but  at  the  same  
time  a  nice  “crunchy”  quality  and  sustain  from  the  compressed  submix.  
This effect can be easily achieved in AD 2. Just click the Bus Channel Label to select the Bus channel,
and you will notice that a Bus send panel appears on top of the mixer:
 
Now  you  can  easily  create  a  submix  and  process  it  using  the  Bus  Channel’s  Insert  Effects!
 
I don't see how you set up a  sub mix though, unless its just a duplicate of the whole mix that you can route through the Bus's FX. So if you wanted just the snare and hats on the Bus, I can't see how you'd only route these
 

Right, I usually compress the room mix or I create a submix manually. Makes no sense to me to do it in AD if you're creating the balance of instruments in Sonar.

The two main reasons I can see for using the AD2 mixer over sonars are:
 
The AD2 presets are all mixed to sound the way they do in the mixer, sending a preset to Sonars console via multible outs, means juming through the presets gives you a different balance than designed.
 
If you create you own sounding kits, you can bring them into projects as whole entities and and they are done.
 
I personally drop all of XLN's processing, and have it playing clean into Sonar. Being that we use often use EQ to deal with problem resonances in a drum piece, means that when you swap a drum piece, you need to re-EQ it as it has different issues. The whole process is clearer in my head if I just use one mixer. The shaping and colouring tools are cool though, so it's not so black and white
 

I'm with Kamikaze here for the most part.
 
I really like the FX within AD2. The EQ, though, I like to do in SONAR.
The compression in AD2 is nice and fast, so while it's a bit of a one-trick pony, it does the one trick well and is good for rounding out the "performance." The distortion and tape FX are fairly versatile and give some sounds that I think might not be as available in SONAR itself. The pitch/volume envelopes are SO powerful and useful and the tone designer is nice and versatile. Overall, I like having the power to use all the internal mixing capabilities of AD2.
 
I'd say overall, what I find myself doing is defining the "effect" of the drum's sound with the FX in AD2, and then make it fit the track with the FX in SONAR.

Jesse G

joyof60
Yup, I'd love to figure that one out! Separate tracks without having to jump back to the AD GUI would be great!

 
 
joyof60,
 
Open AD 2 as a synth and when the Soft Synth options page appears, click All Synth Audio Output as one of the options so the AD2 Channels will appear in Sonar. 
 
In Addictive Drums click on the Kit Window  after you have selected your drum kit or preset.  At the bottom of the mixer are downward grey arrows for each channel on the mixer.  click on the arrow and they will become orange.
 
Now in Sonar, go to each of the AD tracks listed, except for the sole Midi track,  and select the channel input and you will see Addictive Drums listed as an input option.  Select it and you will see all of the kit pieces you can set as input for Sonar.  Only choose MONO for each kit piece and alternate Left and Right IE, (left Snare, Right Tom1, Left Tom2 and so on...)
 
Play your kit back through AD2 and you should see your meters indicating the channel your sound is coming through.
 
Peace,
 
Jesse G

I did and it works great! Thanks so much!   A quick question though, if I use session 3 rhythm files do the kit tracks follow the same? Or do I need to change them according to the way Session 3 has theirs?

When you open the AD2 GUI click on the ? in the upper right, then "Map Window." On the upper left of that next screen you can choose a "Map Preset" and choose GM (General MIDI) when driving AD2 with a GM-based kit (like Session Drummer 3 loops). (You can also make/save your own drum maps - internal to AD2 - there if desired).