Just to be clear on my end. You should have a midi track and an audio track. Any added midi drum data should be put in to the midi track. On the audio track, insert AD2.
Now, set the midi tracks output to the audio track that contains AD2.
Set the audio tracks output that contains AD2 to the audio interfaces output. If you are using a template that has a master buss in it, the audio from your track should be set for the master buss. Make sure the master buss output is set for your interfaces output.
That should cover all the things I can think of. If you are using a midi controller to trigger AD2 you have to turn on the monitoring button on the audio track. It is the button on the right of the record button on the track.