When your voice goes high, the folds are pushed close together and tightened. When your voice goes low, they're pulled apart and loosened. Voice cracks happen when these muscles suddenly stretch, shorten, or tighten.
When your voice goes high, the folds are pushed close together and tightened. When your voice goes low, they're pulled apart and loosened. Voice cracks happen when these muscles suddenly stretch, shorten, or tighten.