Before you create a multicam sequence:

• IMPORT DIALOGUE source files from media browser to bins in the project window. 
• SELECT ALL DIALOGUE source files in the project window (include video clips as well as audio only clips)
  
• CLIP > MODIFY > AUDIO CHANNELS. 
  • Preset: MONO.
  • Clip Channel Format: MONO

As indicated by the FOOTAGE LOG, command click to choose a single video clip and its attendant audio clips. 
⚠ Audio clips will appear in multicam sequence tracks in the order they are selected from the project window.  
⚠ CAMERA AUDIO tracks will appear LAST by default.

CLIP > CREATE MULTICAMERA SOURCE SEQUENCE

• DISABLE: Move source clips to Processed Clips Bin
• Audio Sequence Settings:  ALL CAMERAS
• Audio Channels Preset: AUTOMATIC

The resulting multicam sequence may be edited like any other clip or nest. 

• Load it into the SOURCE MONITOR
• Set IN– and OUT-points,
• TOGGLE destination video and audio tracks in the target sequence
• Use the INSERT or OVERWRITE commands to move your selection to the playhead of the target sequence
  

Why MULTICAM and not sync & merge clips? 

• Multicam sequences combine an unlimited number of video and audio sources
• Multicam sequences can be modified; merged clips cannot. 
• Multicam preserves more clip metadata.
• Matchframe (F) performs more functions in multicam mode.