The Auto Match Pull Factors option links audio and video pull factors when changing session frame rate.
For example, assume a Pro Tools session is set to a frame rate of 25 fps, the audio and video are both playing with no pull ups, and Auto Match Pull Factors is enabled.
If you then change the session Frame Rate to 24 fps, both the Audio and Video Rate Pull settings would change by –4.0% (the appropriate pull setting required by the change in frame rate).
Auto Match-enabled pull factors are applied to any existing Audio Rate Pull Up/Down or Video Rate Pull Up/Down settings.
For example, if audio was already being pulled –0.1% when you changed the session Frame Rate from 29.97 to 24 fps, then the Audio Rate Pull Up/Down menu would switch to
None.