Barack Obama has shown the power of amplifying the voice at key moments. He uses volume to increase excitement as an audience rallies to his opinions. He knows how to stress important words at the right times, giving them an emphatic feel.

He increases his volume when reaching a crescendo, the point when he hits the climax of his talk and underscores a key message. Just as he puts power in his volume when rousing a crowd.

He knows how to allow his voice to trail off when speaking of something of which he disapproves. Amplifying and washing away—Barack Obama uses volume to enhance the efficacy of his delivery.