Learn to Play Shamisen - Striking the String
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This is how to strike the string.
You push the string all the way down to the skin (kawa) and the slide the bachi off the string allowing the string to snap back. It's a lot more fluid than it sounds.
Advanced. You can do it in 3 steps - Chitoshan
Step 1 - Chi: the sound of scraping the skin.
With your bachi, before you reach the string, you scrape the skin until the bachi touches the string. Then you press the string down with the bachi.
Step 2 - To: Sounding the String.
This is obvious.
Step 3 - Shan: letting the string resonate.
After you sound the string, you bring the bachi up off the kawa to let the string resonate fully.