Related Clues:

• Corresponds
• Harmonization, for short
• Simultaneity
• Match, informally
• Lines up
• Matched, after 'in'
• Good thing to be in
• Lip-__
• Sound/picture agreement
• Fit the sound to the action, e.g.
• Fit sound to action, e.g.
• Lip ---
• Lip- --
• Harmonization
• Matches audio to video, say