I just remembered what I had done in the past to get this right. I used the "generate soundtrack" application in BIAB. This allows you to export a wav of very specific length.
The goofy thing is that in order to get the full 16 bar song, you need to set the app to render from -1 to 16 (or you have to be a bit of a math wiz and calculate the total time for the tune!)

I will admit, this along with the stuff in my last post is pretty goofy programming..at least from an end user perspective. Way too many vague boxes to check (do people really need all that from this type of program?)

At this point, I mostly use the program to generate synth backing tracks for the RC50 looper to fill out the trio. For that, and use as a songwriting notebook, it works ok. Don't think I would have spent the $300 that Eddie spent.

I guess for now, I have a solution...