To record music and other sound elements at the correct time code locations on a master format without regard to final levels and mixing.
He'll be responsible for prelaying sound effects for film and television.1990, The Hollywood Reporter, volume 313, numbers 18-34, page 18:
In this way, dialog, music and effects elements can be prelaid to hard disk or MO […]1995, The Mix, volume 19, numbers 7-12, page 74:
prelay
noun
Etymology From pre- + lay.
1
The act of prelaying.
If your show includes a lot of effects, for example, explosions, music, sound effects, or loud noises over romantic dialogue, then your sound-effects supervisor will probably recommend a predub or prelay.2002, Barbara Clark, Susan J. Spohr, Guide to Postproduction for TV and Film: Managing the Process:
prelay
adj
Etymology From pre- + lay.
1
Before a bird lays eggs.
An optimum method for feeding calcium is to start feeding the layer level (3.25% or more) slightly before the first egg, because after hens start laying there is a negative calcium balance when consuming the prelay calcium level of 2.0%.2012, Donald D. Bell, William D. Weaver, Commercial Chicken Meat and Egg Production: