If the loudness value is higher, a costume with a more opened mouth can be switched to. The loudness block takes a constant measurement of 0-100 representing the volume of the sound input. Scratch has the capabilities to animate the mouth based on the volume input of a project viewer's microphone.
Likewise, if the singer's mouth replicates the vocals simultaneously being played out of the speakers, it is considered to be well-done lip syncing.
Outside of Scratch, lip syncing generally refers to when a musical artist's microphone is turned off yet they sing the song to their own prerecorded vocals. A list can also be used, containing the amount of time to wait before switching to the next costume to reduce block clutter. A trick that a lot of animators use is making a sprite with different costumes, all different mouth shapes, and then using the wait () seconds block in between costume changes. Realistic and perfect lip sync is very complicated to reproduce as mouth shapes need to be recorded. Lip syncing involves moving a mouth at the right timing of the sound.
An animated sprite lip syncing to a song.
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