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If you use audio-only clips with video or A/V clips, the audio-only clips are placed in the topmost tracks, and are unmuted. Other audio in the source sequence is muted. If you use A/V clips to create this sequence, the audio tracks for all audio associated with video 1 are unmuted. Multicam editing is enabled for only the video portion of the source sequence.
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However, timecode must be identical on all clips for them to synchronize properly.
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Timecode can also be used to synchronize clips, and it does so automatically. Type the same clip marker name for each clip in the Marker dialog box, and then click OK. Rename each marker so that they are identically named for synchronization. For example, if there is action at any point during a clip that can be used as a sync-point, like an audio cue, cymbal crash, or a camera flash.