Her pianissimo, crescendo and decrescendo were breathtaking. The crescendo and decrescendo contribute to the contour of the piece. Pulmonary valve regurgitation presents as a diastolic decrescendo murmur at the left lower sternal border. Numerous dynamics are marked in the score&colon; "piano", "forte", "crescendo" and "decrescendo". This process is known as decrescendo phenomenon. This call is usually repeated several times, often ending in a decrescendo.