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Audio Post Production Knowledge Base
Sync-pop
A sync-pop is a 1kHz tone that is exactly one film frame in duration, used for matching picture and sound negatives together. The sync-pop must occur exactly two seconds (or three feet) before the first frame of picture (FFOP) in a film reel. If the picture negative contains a standard Academy 
7.1 Multi-channel Audio
7.1 refers to multi-channel audio intended to be monitored through eight channels: seven full frequency range (20Hz to 20KHz) channels and one frequency limited (below 120Hz) channel for the LFE (Low Frequency Effects), or Subwoofer track.
7.1 multi-channel audio has several theoretical channel
Azimuth Errors
Azimuth is the vertical alignment in the plane of the tape path along the record and playback heads of a tape machine or mag dubber. Azimuth issues are timing issues due to the alignment of the tape against the head. Before recording or playing back tape or film, azimuth adjustment is applied
