Relier Pairs SOUNDVersion en ligne Match the meaning to the correct image par Tic San Carlos 1 Pitch. How high or low a sound is. The sound from the bullfrog had a low pitch 2 Vibrate. To move back and forth very fast. A flute makes the air vibrate to make sounds. 3 Loudness. How loud or soft a sound is. The loudness of some sounds can change.