Dither plug in - Only affects the mono or stereo output of a track or bounced file(s).The Dither Setting in the Preference menu - Only affects Audio Suite plug insAs of right now, there have been no other Audio Suite dither programs created to add to the pop up menu that contains the "default" dither settingWhen the "Use Default Dither" is not selected, then a standard dither is used (no noise shaping).Dither on Fades dialogue - Uses a standard Pro Tools dither algorithm.