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State University of New York

Incorrect.

"One" is correct. The sentence starts out using the third person pronoun, "one," so it needs to maintain that point of view throughout. Note that IF you could change BOTH of the pronouns in the sentence to the second person point of view, "you," that would be correct as well.

When one sings in the choir, one should always control the volume so that no particular voice overwhelms the others.