I'm familiar with the functionality of SHIFT or CTRL plus left-click to select multiple clips. But, sometimes, I need to select many, many clips (too many to do one-by-one with CTRL plus left-click) and they are on multiple tracks (SHIFT plus left-click only works within a single track). If I click and drag on the timeline to create a blue region, I can encapsulate them all within the region, but how do I make them (i.e., the clips within the blue region) all selected? If I click anywhere after creating the region, I lose the region.