How to Slow Down an MP3 File With Audacity
Audacity is a free, open-source multi-platform application. With Audacity, you can manipulate an MP3 or other audio file in many different ways. You can even slow down an MP3 file with Audacity.
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Instructions
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Install Audacity. If you don't already have Audacity, download the appropriate installation file for your computer's operating system from the Audacity at SourceForge web site (see Resources). Audacity is free to download and use.
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Open Audacity, then select "File" and "Open" to open the MP3 file you want to slow down.
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Find and highlight the portion of the MP3 file that you want to slow down. If you want to slow down the entire file, press "CTRL-A" on your keyboard. Alternatively, you can click "Edit" then "Select" then "All."
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Select the "Effect" menu. From the Effect menu, choose "Change speed." Move the slider to the left to slow down the file or enter a decimal number to indicate the speed ratio you desire.
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Save the MP3 file with a different name to distinguish it from the original.
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Tips & Warnings
When you slow down an MP3 file with Audacity you also lower the pitch in the process. If you slow down the file so much that you can't understand it, you can raise the pitch by selecting the portion of the file that is slowed and then clicking "Effect" and then "Change Pitch."
