OK, i know it's a old question and my answer will maybe not help, but...
It's possible with a TD15 connected in USB.
The TD15 is view as a sound card.
So you can route the output to the drum mpdule.
I had made a kit that is all set to "off" in the Brain, so if i need the sounds of AD in one specific tune, i use it... I can also make all possible combination of sounds with AD and TD15.
Work just great