What is a voice crack? A voice crack is an audible discontinuity in a vocal performance that can take several forms: a sudden pitch jump, an audible pop or click, a brief misaligned transient, or a burst of unwanted breathiness. In technical terms, voice cracks are often transient events caused by non-linear vocal fold behavior, abrupt changes in source signal level, or recording chain issues (clipping, mic movement, or plosives). In modern pop and indie production they stand out because of close-mic techniques and loud, transparent mixes that expose small imperfections.