I just did the extreme node adjustment test. It is clearly an issue. When I came out of my solo and went to rhythm I took the guitar volume to zero and took the piano up a lot. Next I saved as .wav. The result was the guitar track went to zero volume for the whole recording and the piano track when up for the whole recording. I went back to check the RealBand playback against this and it was doing exactly what I wanted.

My suggestion is for others to give this extreme test a try and see if it can be isolated to just my system.

As before to get this to-do finished I sent the mix out to another computer. Unfortunately it is not as loud and of course more work. I guess I will see if I can use line out rather than headsets out to get it louder.
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John Bowles
My playing in my 20s:
https://www.reverbnation.com/johnbowles