Selecting Multiple Items
Select multiple items by holding down the left mouse button and dragging to create a selection zone. This zone will select the keys whose central point lies within the zone as well as the clips that are entirely enclosed by the zone.
Using a selection zone to select multiple items.
You can also select multiple items by holding down the Ctrl key and clicking on the items in the tracks that you wish to include in your selection.
While the Ctrl key is held down:
Dragging to create a selection zone will add items in that zone to the current selection,
Clicking on an item that is already part of your selection will remove it from the selection.
To clear a selection, click on an empty area in the tracks.