I activated Pitch Lock, but it doesn seem to do anything. Whats up?
There are two possible reasons why Pitch Lock might not be functioning as you expect. First, it’s important to note that pitch locking is set for a given media source at the time the source is opened. (This is a technical limitation.) So if you change the setting for Pitch Lock in Preferences/Options, you will need to use the Reload Media menu item to re-open your media with the new Pitch Lock setting. The other reason Pitch Lock might not be apparent is that adjusting the pitch in real-time is a fairly intensive process, and gets more difficult the farther away from 1x speed you go. If QuickTime gets to a point where it can’t adjust the pitch and maintain fluid playback, it will stop adjusting pitch.