walla
/ˈwɑlə/
noun
- A background noise or murmur, especially the indistinct chatter of a crowd in a film, theater, or television production, created by extras or sound effects.
- The sound designer used a loop of walla to fill the background of the restaurant scene.
- The director asked the extras to create walla to make the party scene feel lively.
- In radio dramas, walla is often recorded separately and added during editing.