I can confirm that the reported issue is reproducible using the AAX wrapped AGain SDK example. Simply move the gain fader using the mousewheel and you’ll see the described glitches. They get more apparent when you hold down the shift modifier for fine movement. Instead of moving smoothly like in other formats, the slider will occasionally jump around when the wrapper interferes with a scheduled UI thread idle paramter update holding one of the previous values during the ongoing edit.
Best,
Ray