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Noise reduction needs a sample of the noise on its own.

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Select a second of the pause after the question.

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Open the Effect menu, then Noise removal and repair, then Noise reduction.

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Click Get noise profile.

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Audacity listens to the selection and closes the window.

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Now select the whole recording with Ctrl and A, and open Noise reduction again.

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Set the reduction to 12 decibels and click Apply.

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More is not better:

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too much makes the voice sound metallic.