Audacity

Audacity is an free and open-source, easy-to-use, multi-track audio editor and recorder for Windows, macOS, GNU/Linux and other operating systems. Audacity can record live audio through a microphone or mixer, or digitize recordings from other media. Import, edit, and combine sound files. Export your recordings in many different file formats, including multiple files at once. Audacity supports 16-bit, 24-bit and 32-bit. Sample rates and formats are converted using high-quality resampling and dithering. The easy and intetive workflow of Audacity supports editing with cut, copy, paste, delete and unlimited sequential undo/redo.