I'm not real experienced at this aspect but I did do some experimenting. I first used MIDI OX & MIDI YOKE. I told one of the controls in AT3 to learn. I sent CC7 to it and it learned fine. This is with the standalone version of AT3.
I then opened RB and using the event list I created some CC#7 changes on a midi track. If I clicked on transmit in the Event list AT would change accordingly. If I played the track nothing happened.
As far as using the VST version I could get nothing to happen.
May be just my understanding or lack there of of how to set up AT3.
Scott if you tell me how you set AT3 up as an automated VST maybe I can get it to work. Just realized that if you have AT3 you must have tried it yourself with the same results.

John
ESI Gigaport HD+
Lenovo Turion II /4 Gig Ram/ Win7x64 be
15.6" Monitor
"The only Band is a Real Band"
www.wintertexaninfo.com/BANDS/JohnnyD.php