Yes, it’s really free. No kidding. Catch? Only works on Windows… But that’s ok ’cause if you’re on a Mac you can just use GarageBand. Here’s a video of how it works.
The sweet thing about this program is that it runs without installing on your system. So you can just throw it on a thumbdrive and it’s ready to go. It’s pretty simple and exports right to iTunes. Works great!
You can download it at www.iringer.net