So does this mean that I can the MIDI out on my Focusrite to my drum machine MIDI in and RB will play those Real Drums with my drum machine sounds by sending MIDI note on messages to the drum machine?
'Realdrums' usually aren't MIDI, but if you do have MIDI drums to work with,
sure you can; just make sure to route the audio from the drum machine back in to RB .. easy!
Can I make RB play ANY source of MIDI drums? Like if I import that track into Pro Tools and set up a Steven Slate drum kit, would that track play with the Slate drum sounds?
Again, if MIDI, yes. I can use the Slate drums right inside RB without Protools, so I would expect ProTools could handle it (grin).