Audacity has tools for filtering out background noise.

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You can remove background noise in Audacity with the "Noise Reduction" tool. Use Audacity's Noise Reduction tool on a small piece of your audio first, and then expand the range. No tool for removing background noise is perfect, including Audacity's, so expect some audio distortion.

If you've ever recorded a podcast, music, or a speech, you've probably had to deal with background noise. Unless you've got a professional...

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