JJJ, VideoTrack you are both right smile

VideoTrack outlined the core of request pretty accurately:
"These features should all be part of the program, not requiring externalization."

JJJ, this:
"save a copy of my song"
"in the copy replace all tracks with my solo RealTrack, generate and freeze"

This is 90% my workflow as well.

But thinking a bit "neutrally" on the issue, it is still boils down to number of available tracks that are needed, whether you see them (visually) as separate tracks or not. JJJ wants it automated and user friendly. And that is great (I support that too), but still we are talking about the number of available usable tracks to support these bar "freezes" or other RealTracks or Soloist tracks or Midi.

So my wish still stands. Open Mixer! How tracks are automated and how they can be hidden or un-hidden is a good candidate for another wishlist topic. Perhaps exactly how JJJ imagined:

"Just add a little arrow to each bar and when I click the arrow a small dropdown entitled Regen appears and it lets me click a track to regen. NOTHING else in the song changes."