
Overdubbing (the process of making an overdub, or overdubs) is a technique used in audio recording, whereby a performer listens to an existing recorded performance (usually through headphones in a recording studio) and simultaneously plays a new performance along with it, which is also recorded. The intention is that the final mix will contain a c...
Found on
http://en.wikipedia.org/wiki/Overdubbing

1) Adding additional musical parts on a track of a multitrack tape.
2) Sending a previously recorded signal through a console and mixing it with the audio from a new sound source, recording onto another tape.
Found on
http://www.encyclo.co.uk/local/20447

Enables one or more of previously recorded tracks to be monitored while simultaneously recording one or more signals onto other tracks. This process can be repeated until the song or soundtrack has been built up. If a mistake is made, it is possible to recue the tape to the desired starting point and repeat the process until you have the best t...
Found on
http://www.encyclo.co.uk/local/20532

This is a recording process used in multitrack recording. Basically the performer will listen to previously recorded tracks while they record another part to a different track. The tracks are then combined, usually to a stereo pair, during the mixdown process.
Found on
http://www.songstuff.com/glossary/O
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