Again that's down to the synth. To see what I mean open Session Drummer 3 and go to the mixer page. You'll see at the very bottom of each drum an output number. Set to one by default. You can change each drum output to the one you want to use.
In the case of SD3 twelve but it is a synth setting. Once the output has changed select that as an input to an audio track and you'll have that drum through that audio track.
There's a track template included that will set Session Drummer 3 up like that for you.