Okay thanks fer your insight
Doesn't appear to be related to "display envelopes on a percentage scale" approach
Set up a new track - changed the option to both checked and unchecked, and restarted X2 on every trip.
Basically - no matter what I do - using the "Draw Freehand" Tool, either in Draw or Line mode , I can draw the nodes or the line, and when I releast the mouse the edited points move up 3db or so.
It's a real pain cuz it makes it really really hard to smooth the automation curves.
Offset mode investigations were no help either - but thanks
Any other ideas - and thatnks fer talkin about this !