Hi BT - thanks for the help.
Actually, today I was able to fix the Pro-2 by updating to the latest Beta OS. It was suggested in a different thread (for some reason).
The person I spoke to has clarified that I wouldn't need to send in the whole unit, just the board. That's thankful, because I have had bad experiences with gear being sent by mail (and received by me).
My apologies about the acquisition comment - I'm glad to hear it's good there still. Also - the person from support followed up and clarified that the whole unit would not need to be sent in (whew), not that it's needed at this point.
To summarize: If anyone runs into this problem, I found that calibration (and reseting calibration in the debug menu) may not cure your issue for whatever reason. Sometimes I would find that I would get nothing counterclockwise from 12 o clock. Other times, I would get an inversion where the min was at 12 o clock and it was max at either completely counterclockwise or clockwise. The third thing would be a strange hump around 1-3 o clock. It seemed to change based on where the knobs were, but ultimately, it didn't seem to fix anything.
FIX: Running the latest Beta OS (1.4.0.5) did fix this, whether it actively fixed the issue or passively (just putting new firmware on reset something).
Now, I haven't gotten into whether it's completely fixed because I think it goes to 'min' at around 9 oclock, but I'd argue that would be within specs of the potentiometer and/or the filter. But the behavior seems identical to Filter 1.
And my apologies for the delayed reply - I guess I don't have it set to alert me to new replies.