The study offers measurements of the vocal breaks occurring from the modal to the falsetto register in an untrained barytone. The breaks were achieved by increasing the expired airflow. An analogy with a labial pipe served as a help. The voice phenomena were divided into three regions. In the region of low modal frequencies (A–e) a simultaneous sounding of both the modal and falsetto registers was investigated. This was registered perceptually as vocal roughness. Under special conditions a subharmonic tone was produced. In the medium frequency region (e–g1) the vocal breaks occurred. The break intervals occupied the mean value of about a quint on the modal tone e. With increasing modal frequency, the break intervals decreased. In the high-tone region (g1–e2) only the falsetto register could be pro