Okay, I got it. Dug around the forum a while and found a thread where a guy mentions right-clicking and choosing "Auto Convert Individual MIDI Track To Audio Track".

For anyone else who hasn't done this, do a search in Help for auto convert, and you'll see a result explaining this option (which is a new option, btw). There's also a topic on Rendering MIDI to Audio. I guess I was searching for the wrong word when I was searching "record" or "record VST". It's called RENDERING or CONVERTING, apparently.

The only problem now is, I'm not able to get the adjustments I make in my VSTi (vibrato, etc) to "stick" and to show up in the resulting audio track that RB converts it to. Any ideas on how to save the current VSTi settings so RB will convert it that way?