overdub

verb (used without object), o·ver·dubbed, o·ver·dub·bing.

1. to add other recorded sound or music, as a supplementary instrumental or vocal track, to a taped musical track to complete or enhance a recording.

verb (used with object), o·ver·dubbed, o·ver·dub·bing.

2. to add (a track or tracks) to a musical recording.

noun

3. a recorded segment or layer of instrumental parts, vocalization, or sound effects integrated into a musical recording.

verb (ˌəʊvəˈdʌb) -dubs, -dubbing or -dubbed

1. to add (new sound) on a spare track or tracks

noun (ˈəʊvəˌdʌb)

2. the addition of new sound to a recording; the blending of various layers of sound in one recording

v.1954, from over- + dub (v.). As a noun (over-dub) from 1953. Related: Overdubbed; overdubbing.