It was affected:kakashi's clone was not affected by itachi's genjutsu , so I would assume that applies to sound genjutsu too.
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No this is how using Senjutsu chakra works:the frogs can only help him gather natural energy , naruto would still have to use senjutsu chakra at the expense of his own chakra , while KCM naruto has an extra chakra source from kurama other than his own
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