No problem to connect V Drums to standalone version of Superior Drummer 3. In S1 however, I cannot even get V Drums to register incoming MIDI signal on track let alone trigger SD3.
Add V Drums as "New Keyboard" with ALL MIDI channels selected. All software fully up-to-date.
See the following video for greater detail:
Studio One 4 Professional
Windows 10 Pro
RME Fireface 400 (Firewire)