If I have a single user scale assigned to multiple tracks and I am adding and subtracting notes on the fly, only the active track will refresh to the new notes in the user scale. I have to manually reselect the scale on a track by track basis to have them update to the newly chosen notes. Adding and subtracting notes in a user scale is a really great performance technique, and it would be made much better if all tracks responded to the changes for the user scales in real time.