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New software called Levelator may solve the tricky fluctuating audio level issue many teachers with limited equipment face. It automatically adjusts the audio levels within a podcast to account for variations in level between speakers. Drag-and-drop any WAV or AIFF file onto The Leveler’s application window, and a few moments later you’ll find a new version which just sounds better. The application is available for Windows and OS X - it’s free (for non-commercial use). From the website:

Have you ever recorded an interview in which you and your guest ended up at different volumes? How about a panel discussion where some people were close to microphones and others were not? These are the problems the post-production engineers of Team ITC solve every day, and it used to sometimes take them hours of painstaking work with expensive and complex tools like SoundTrack Pro, Audacity, Sound Forge or Audition to solve them. Now it takes mere seconds. Seriously. The Levelator is unlike any other audio tool you’ve ever seen, heard or used. It’s magic. And it’s free.