The reason it got dragged out so long was that I was unable to record the reverb to a track though it worked well enough when bouncing to a file. Now I understand better how to do this, I would like to write this up on my web page since I can't find a YouTube tutorial that is clear enough so I'm trying to get this clear in my own head.
I should clear up my final confusion by experimentation of my own. Thanks all especially Atlas and Pete.
I'd like to add here (never mind, just noted the other pages of this thread...excuse me!): if you put a reverb plugin on an aux bus, you'll want to make sure the effect is 100% wet. So in Space Designer you'll want to set the DRY slider (top right) to 0, and the REV slider preferably to Max.
As a matter of fact, since I've now been successful in recording the reverb on the first movement, I decided to leave it alone.
But I did set up the second movement beginning with all the Space Designer auxes set to maximum reverb, I've tried test recordings with the fragment I have and, no reverb at all in that recording though quite prominent when just played in the file.
Outside of that, the mixers pretty much looks identical as far as I can see.