Certain MP3 files sometimes do not play at a high enough volume for the listener to enjoy. A few options will allow you to play your MP3 songs at a louder volume.
Adjusting MP3 Volume with Audacity
Download Audacity (see link in Resources).
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Open Audacity. Use the menu "File" > "Open" and select the desired file that you want to adjust.
Select "Effect" > "Amplify."
Adjust the decibel level to the desired level. Use the "Preview" option to test the new volume.
Save the file.
Adjusting MP3 Volume with iTunes
Download Apple iTunes (see link in Resources).
Select the song in iTunes that you want to adjust. If the song is not yet in iTunes, drag and drop the file into the "Library" or a playlist.
Adjust the "Volume Adjustment" slider as needed, and select "OK."