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If you wish to review training and reference materials regarding Crackles - Low Pitched (Rales), we provide complete lessons. The lesson modules(s) listed below may be useful. Each lesson includes text that explains the auscultatory sound and its clinical significance. The lesson also includes an audio track for playback. A waveform provides a great way to visualize the sounds. Finally, we also include an animation video. For heart sounds, the video illustrates heart muscle and valve movements along with blood flow. For lung sounds, the primary source of the sounds can be seen. Each module also includes a quiz. A passing quiz score is require for earning a course certificate of achievement.