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Putting "whump" in at the beginning of movement loads the sail with air pressure and makes the movement immediate and crisp. The kite gets up to speed almost immediately, instead of slowly accelerating until it achieves the ultimate speed at which you want it to move. It adds intensity to the movement and decreases response-to-input time. Depending on the degree of usage it changes the mood of the "performance" from sleepy to energized. There is a detailed discussion of it on this site. Search it if you haven't already. Watch this video and you will see the transition from near zero whump to full whump. I'm not talking about overall speed which also increases to match the music, but how quickly the kite moves from stop to go, or changes direction with almost instant acceleration. P.S. -- It is also being able to "punch" to decelerate the kite quickly, or to stop motion instantly. Here's another video. You can see the lesser amount of overall intensity to match the mood of the music. Whump is what turns kite from toy to art.