Hi, I'm not getting any sound out of AD2 when I'm using the VST in Sonar.  The standalone works fine.  It's not a question of mapping the triggers to the right sounds, since I don't get any sound even when I click on the drums in the kit view (again, works fine standalone).  Anyone have any experience of this?

Once you inserted the AD2 synth, (I'm going for the obvious here....just in case...) is the "Input Echo" button on? 
 
More info here: https://www.cakewalk.com/Documentation?product=SONAR%20X2&language=3&help=Playback.34.html