You can make your audio louder in Audacity's editing software by utilizing the Amplify and Normalize effects.

You can enable autotune in Audacity by installing the GSnap plug-in, which works with Windows, Mac, and Linux computers.

Audacity, the venerable and much loved open source audio editor, has a 2.0 release out (as of March 13) in versions for OS X, Windows and GNU/Linux. Here's a rundown of what has changed: Many effects ...