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These kind of sheets were prepared by the person track-laying a piece of film, to inform the dubbing mixer about what was intended for the audio mix. In this case, film editor, Oliver White, was also the track-layer. The sheets are from episode 6 of the 1981 drama series, Nanny. Wendy Craig played the title role.
The following comment was left on the Pebble Mill Facebook page:
Roger Slater: ‘The numbers are film footage from zero at first frame and were on a large display beneath the screen in the dubbing theatre. The yellow blocks represent where the sound is in the tracks and were hard cuts or mixes as decided in the mixing. The arrows are just an indication of where to go. This is a very simple chart with a few tracks, You could be mixing 8 -10 or up to 40 tracks on a big drama or film.’