In addition to applying effects to clips, we can also apply them directly to tracks. Though this isn’t useful for most effects, there are several types of clips for which this is extremely useful. One of these is the Safe Color Limiter, which we mentioned in Lesson 5, “Color Treating and Correcting.” Applying effects to empty video tracks, known as applying effects to filler, is a unique feature to Avid editing systems and can be quite powerful.
The limiter is most commonly applied to an upper-level video track so that it limits the entire Timeline. Alternatively, it can be applied only to selected regions of the Timeline using the Add Edit command to create edits in the filler track.