Yep
Instead of 'arming a track' just select a new blank track in RB, then go into Options-Preferences-Audio-Drivers (button)
Select (only) the audio inputs you want to record to your new blank track.

This assumes your MIDI module's outputs are audio out from the synth to the audio in of your interface ..
You may need to route things correctly in your audio interface to record it as it plays, but it is very much possible to do this (if I understand the question).


Make your sound your own!
.. I do not work here, but the benefits are still awesome