This is weird.. I programmed a track in Addictive drums, and after a while I started hearing some phasing, normally a sign that two identical tracks or notes are triggering at the same time. I started muting tracks and eventually muted the actual source track... yet AD keep playing, but now without the phasing. I can't find ANY hidden midi source, not even in Track Manager.
 
Any ideas?

Perhaps the "sync" button is on in the AD2 beats interface? 

If I remember correctly, AD2 plays its own MIDI grooves?  You might want to find the STOP button within AD2. I think I might be saying the same thing Sander said. :-)
 
Hope this helps you,
Jim

Nope, this is my own programmed song playing back. Not a loop, no Sync. An entire song, playing correctly. It's very weird.

This always catches me off guard! When I hear the "doubled/phased" sound, I figure I am forgetting to turn something off. I figure it's got to be one of these:
Is the midi data track playing AD2?
Or is either of the sync-start stop buttons on, in the AD2 window?
Otherwise how could be doubled?
 
I hope some one can clear this up for both of us!
You'll find it, though I suppose you'll be grumbling till you do!
I am! LOL
Michael

Are you using AD as a Simple Instrument Track or split midi/Audio?

This problem is why I quit using AD2 and picked up SSD4. AD2 would get out of sync, and it sounded phased, including missing hits. I tried adjusting my buffers, audio and midi. It would fix for a while, but it would eventually happen again, especially if I was moving through the presets while linked to a midi track in Sonar. If I used the internal browser to audition, then it rarely happened. I started just rebooting the computer and loading the exact same preset, and the problem would stop, which meant that I didn't have any errant midi. Since I've switched to SSD4, I've never had this problem. It's been solid. I did notice that the higher the bpm, the more I encountered the problem with AD2.

Possibly AD's audio output was inadvertently included in the bounce of another track/bus...?
 
EDIT: This has never happened to me by the way. 

This sounds to me like a problem I had. 
 
Are you using the AD2 track template created by the Cakewalk guys?
 
IIRC, my project was receiving drum audio from both the individual drum tracks to which pieces from AD2 were routed and from the AD2 plug-in itself, which has its own track. 
 
I figured out what was going on by muting every single thing everywhere that had to do with AD2, then playing the project while turning sound sources up one a time. 
 

But in that case, muting the MIDI would still silence all output.