How To Convert A Stereo Audio File To Mono Using Audacity

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1. Click the down arrow on the track to open the menu.
2. In the menu that drops down, select Split Stereo to Mono. 
3. Click X to delete one of the two tracks. 
4. To save the new mono audio file, click File.
5. Click Export to save file in a specific format.
6. Select a format to export. In this case WAV. 
7. Click Save to save with the desired filename.