The following are a few free, and often open source, tools:
- Audacity: Audacity is a wonderful program for creating and editing audio files. You may download and install it on your own computer, and it works on Windows, Mac, and Linux. For more information and to download it, please visit http://audacity.sourceforge.net/.
- LAME: To convert Audacity projects to MP3 files, you'll need to use an MPEG Audio Layer III (MP3) encoder. LAME is very effective. For more information and to download it, please visit http://lame.sourceforge.net/.
- LibriVox Checker: LibriVox has made available a program that checks volume. It's extremely useful and easy to use. It also checks file formatting, though this is ...