Let us suppose we want to play music on a shot of children playing in a park, we cannot use assemble editing to do so. Here, insert editing comes in handy. In the insert editing mode (Fig. 8.10) only the video or audio of our choice is re-placed on the master tape. Take the ex¬ample mentioned above. We have al-ready edited a scene of children playing in a park. The master tape already has ambience sound of children playing. But we want to replace the ambience sound with some soft music. We can select only audio on the recorder and replace the ambience sound with music from the player. Remember that for insert editing to be successful, we must first record a continuous control track for the whole length of the master tape. In other words, when editing in insert mode, we do not transfer fresh control track to the record videotape. Instead, we use it as a guide and position reference for laying down the inserted video on the tape.
In digital editing, although we first lay the shots, in assemble mode on a video layer in the timeline, we can switch to insert mode by inserting another video layer. We can then insert a different shot on the other video layer. The computer will then play back the video on the lower layer and switch to the video on the upper layer, and again back to video on the lower layer. The following two sections discuss the two systems of editing.
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