Music Production
Overdub
An overdub is a new part recorded on top of tracks that already exist, while the performer listens to them, such as adding a vocal, a solo or a harmony to a recorded backing.
Overdubbing is how one musician can play every instrument on a recording, and how a band adds parts after the main session. You listen to the existing tracks in headphones and record the new part on a new track, in time with what is already there (multitrack recording).
Common kinds of overdub
- Lead vocals and solos, recorded over the band's backing track.
- Harmonies and backing vocals, often in several layers.
- Doubling: recording the same part twice on two tracks to make it sound thicker. The small natural differences between the two performances create the effect, which is why copying one track doesn't.
- Extra instruments: percussion, strings, keyboard pads and sound effects.
Punching in
To fix one phrase without re-recording the whole part, you punch in. Playback starts a little before the problem (the pre-roll), recording switches on at the punch-in point and off again at the punch-out point, and the new phrase replaces the old one in exactly that spot. For a seamless join, match the original's sound and energy, and place the punch points in small gaps.
Takes and comping
Many DAWs record repeated passes as separate takes, often stacked in lanes under the track, especially in loop (cycle) recording. Afterward, the producer picks the best moment of each take, a line from one, a word from another, and joins them into one finished performance. Studios call this comping, short for compiling; it is a different meaning from jazz comping.
Tips for good overdubs
- Get a comfortable headphone mix. Hear enough of the backing to stay in time and in tune, and enough of yourself. Singers who can't hear their own voice often drift out of tune.
- Record to the same tempo grid as the existing tracks, with the same click track if they used one.
- Watch for delay. If what you hear while recording arrives late, the audio interface's direct monitoring or a smaller buffer size usually helps; DAWs normally compensate for that delay when they place the new recording.
- Keep takes you might want. Name and save them before recording over anything.
Common questions
What does overdubbing mean?
Recording a new part on top of existing recorded tracks while listening to them, so it plays back in sync with everything else.
What is the difference between overdubbing and punching in?
An overdub adds a new part, usually on its own track. A punch-in replaces a short section of an existing part by recording over just that passage.