There will be instances when you would like to reverse the status (enabled or disabled) of one or more Track Selectors. One example would be if all the video and audio Track Selectors were enabled and you needed to quickly disable all of the video Track Selectors. See the How it works... section for another example.
Follow these steps:
Click and hold the mouse button down in an area of the Timeline window (not within the tracks of the sequence) that is either above or below the Track Selectors for either the Source side or the Record side.
Drag the cursor across the Track Selectors. Note that you will see a ghosted box (the Lasso), and that you do not have to surround the Track Selectors with the Lasso. You only have to make the Lasso come into contact with a Track Selector.
Release the mouse button.