Wait. Are you trying to use Drumagog's MIDI In or Out? They are entirely different, and I think the 2 may be getting confused. Based on your original post, it sounds like you're trying to use Drumagog's MIDI Output (not the Input, as some of the other posts have suggested).
Drumagog's MIDI Out is for when you want to turn an Audio Track into MIDI (i.e. to play with Kontakt, Superior Drummers, etc). Drumagog's MIDI In is when you want to use Drumagog like a virtual synth, and your source track is MIDI.
The problem with MIDI note mapping, is that there are 2 different standards. Drumagog uses the same standard as found in Cubase, but it is different than, say the one used by Cakewalk. What 1 program calls C3, another program may call it C1.
Do you have it set up far enough that you can record Drumagog's MIDI Output to a MIDI track? You should be able to record-enable the MIDI track that Drumagog is sending to, and record that as MIDI. If you try that and don't get anything, then the routing is incorrect.
Depending on your DAW, you may need to use a MIDI router (like MIDI Pipe or MIDI Yoke) to route the MIDI signal from Drumagog back into your audio program. You can find details and instructions on this in the Drumagog 4 manual and at our old website:
http://d4.drumagog.com/owd.htm
This is one of the main reasons we added Plugin Hosting to Drumagog 5, since you simply host the VST instrument directly in Drumagog no matter what host DAW you are using. Cuts out extra latency and these extra steps.