“Frequency Smoothing” spreads the noise reduction across neighboring frequency bands.At higher numbers (to a maximum of 24), more noise will be removed, but at the expense of likely removal of “good” signal as well. The smaller the number, the more selective the removal algorithm will be. “Sensitivity” controls how similar the audio must be to the sample to be considered noise.The greater the decrease, the more obvious the effect will sound.

Audacity will edit the waveform to reduce sounds that match your noise sample by the chosen amount. Choose the decibel level by which you want to reduce the sound.

Open “Effect -> Noise Reduction” from the menu bar again.Ħ. If the noise runs through your whole track, for example, select the whole track at this step.ĥ. Select the region of the track you want to remove the noise from. Audacity will mathematically analyze the selected noise so it can detect and remove similar noises later.Ĥ. When you click this button, Audacity builds a noise profile based on your previous selection. Click “Get Noise Profile,” which closes the window. Open “Effect -> Noise Reduction” from the menu bar.ģ. If you have a few seconds of room tone at the beginning or end of your tape, this is a perfect use for it.Ģ. Make a selection that contains only the noise you wish to remove. Its noise-removal tools are effective, if blunt.ġ. Remove Background Noise on macOS with AudacityĪudacity is a free, open-source cross-platform audio editor.

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