Overdub (verb)

To add an additional audio track to an existing recording, often to improve or enhance it.

Origin:

1930s, from over- + dub (verb).

Examples:

1. The singer overdubbed her vocals in the studio.
2. The band overdubbed the guitar parts in the song.
3. The sound engineer overdubbed the drums to give them more power.
4. The producer overdubbed the background vocals to make them stand out more.
5. The musician overdubbed the saxophone solo to give it more expression.