Noise Gate
From Audacity Development Manual
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Use the Noise Gate ---
- Accessed by:

Amplification (dB)
- Input Box: Type a value for the amount of amplification you would like to apply. Positive values make the sound louder, negative values make it quieter. As you type, the New Peak Amplitude input box will be updated.
If you take the negative of the value shown in the Amplification (dB) box, this will give you the current peak amplitude of the selection. For example, in the image above, the audio selection had a peak amplitude of -3 dB.
- Slider: Drag the slider right to make the sound louder, or to the left to make it quieter. As you drag, your selected value will be updated in the input box, and the New Peak Amplitude input box will be updated.
New Peak Amplitude (dB)
Type in the value you would like for the new peak amplitude of your track. As you type, the Amplification input box will be updated.
Allow Clipping
If this box is not checked, and you attempt to enter an Amplification value that will result in a New Peak Amplitude of greater than 0 dB, the OK button will become inactive. This will prevent you from applying too much amplification. If this box is checked you can apply as much amplification as you want, possibly creating a horribly distorted sound.
Buttons
Clicking on the command buttons give the following results:
- gives a dropdown menu enabling you to manage presets for the tool and to see some detail about the tool. For details see Manage presets
- plays a short preview of what the audio would sound like if the effect is applied with the current settings, without making actual changes to the audio. The length of preview is determined by your setting in , the default setting is 6 seconds.
- applies the effect to the selected audio with the current effect settings and closes the dialog
- aborts the effect and leaves the audio unchanged, closing the dialog