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Adjusting audio
Enter edit mode
Click Edit and switch to the Audio tab.
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Adjust the volume
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To change the volume of the whole file, drag the Volume slider to the necessary level. 100% is the original volume.
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If parts of the file are too quiet, select the Normalize volume option to make them louder.
Remove noise
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Select the Remove noise option.
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Drag the Noise level slider to set the noise level you can hear in the file.
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Exit edit mode
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Click Apply to accept the changes. To fix the volume for all the files in the list, select Apply to all files.
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If you don't need any further editing, click Save and Close to close the editing window.