第三線上の音符のハタの向きを指定する
a4 b c b
\override Stem #'neutral-direction = #up
a4 b c b
\override Stem #'neutral-direction = #down
a4 b c b
\override Stem #'neutral-direction = #up
a4 b c b
\override Stem #'neutral-direction = #down
a4 b c b
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