There are several strumming techniques specific to the ukulele. One of these techniques is called scratching or chunking. The chunking technique essentially provides an atonal and muted scratching sound as you scrape your fingers across the strings. Chunking allows the player to keep good time while strumming chords. While this isn't a very complex technique to master, it is essential for beginning and professional players alike.
Position the ukulele upright in your lap.
Grasp the fret board with your left hand. Let the left palm rest on the fret board to mute the strings.
Use the tips of the index, middle, ring and little fingers on your right hand to strike down on the strings just over the ukulele's sound hole. Then immediately dampen the strings with the top outer edge of the right palm. This should be one fluid motion.
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