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After completion of photography, Coppola scheduled one year for Lucas to complete postproduction.[14] Lucas edited the film on a German-made K-E-M flatbed editor in his Mill Valley house by day and Walter Murch edited sound at night, comparing notes as each session ended.[3][14] Murch compiled and synchronized the sound montage, which includes elements such as the "overhead" voices, radio chatter and announcements. The bulk of the editing was finished by mid-1970.[citation needed]