Good question Punkin,
I couldn't get it to work and there's no help available for it either. I have seen a fretboard view in PA9, but at best it was a guess by CakeWalk as to what you were actually playing. Some of the stretches were impossible!
I can only guess that the Tab function is a throw back to Sonar 2, and again I wouldn't rely on its accuracy if indeed you could get it to work.
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BluesMeister