Doing my first feature length film sound track. The person who's doing DCP asked that I deliver the 5.1 mix with a 2-pop sync. I have no idea what that is. Anyone know? Thanks!

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Exactly 2 seconds before the first frame of picture you put 1 frame of 1khz tone. Used to sync audio and video. You can use a signal generator to do this such as the one in Pro Tools.

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