Grass Valley NewsEdit LT v.4.1 - Manual (Page 39)

Setting Preroll
Digital News Production 39
Setting Preroll
Setting Description
Get Preroll From Deck Check Get Preroll From Deck to use the preroll settings from your
tape deck instead of those configured in NewsEdit LT.
Preroll Enter the number of seconds of preroll to use when recording from
this source. This setting overrides the source’s Preroll setting
unless you check Get Preroll From Deck.
Aux Preroll Enter the number of seconds of auxiliary preroll you want to use
when using an auxiliary input or a non-remote source.