Editing Automatic double tracking (section)

==Background==
As early as the 1950s, it was discovered that double-tracking the lead vocal in a song gave it a richer, more appealing sound, especially for singers with weak or light voices.  Use of this technique became possible with the advent of [[magnetic tape]] for use in sound recording.{{citation needed|date=August 2023|reason=Unclear why the earlier electric sound recording media might be unsuitable.}} Originally, a pair of single-track tape recorders were used to produce the effect; later, [[Multitrack recording|multitrack]] tape machines were used. Early pioneers of this technique were [[Les Paul]] and [[Buddy Holly]].

Before the development of ADT, it was necessary to record and mix multiple takes of the vocal track. Because it is nearly impossible for a performer to sing or play the same part in exactly the same way twice, a recording and blending of two different performances of the same part will create a fuller, "chorused" effect with double tracking. But if one simply plays back two copies of the same performance in perfect sync, the two sound images become one and no double-tracking effect is produced.