Audacity

Audacity is free, open source software for recording and editing sounds.

Summary
A fast multi-track audio editor and recorder for Linux, BSD, Mac OS, and Windows. Supports WAV, AIFF, Ogg, and MP3 formats. Features include envelope editing, mixing, built-in effects and plug-ins, all with unlimited undo.

Download
Product: Audacity
Release: 1.2.6
Release name: audacity-win-1.2.6
Installer release date: 2008-09-21
Installer type: Windows Installer / MSI
Download link: audacity (github.com)