Technique from audio recording, where different tracks are joined to one.
To add (supplementary recorded sound) to a previously taped musical recording. --from AHD
Neil Rusthon on Derrick May [...]
At that time, Derrick was recording on very primitive analog equipment: 'Nude Photo,' for instance, was done straight onto cassette, and that was the master. When you're using that equipment, you must keep the mixes very simple. You can't overdub, or drop too many things in; that's why it's so sparse.
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