 Aside from the technological advantages of digital editing, in his book "In the Blink of an Eye", editor Walter Murch mourns the loss of the older analog solutions.Analog editing requires the editor to frequently move back and forth or scrub in the source material to gain an overview, thus increasing one's familiarity with it.Since undoing an edit is such a laborious process, there is a high incentive to get the best edit cut the first time.