三角琴鍵重-磨擦力
三角琴的鍵重，不是線性：止音頭升起、escapement friction、上升都不同，不可以簡單用靜態重量衡量。這一節先解決磨擦力問題。下一節分享對動靜態重加和槓杆的一些討論。 鋼琴調音課程 https://weiyanpiano.com/
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