Audacity can record live audio through a microphone or mixer, or digitize recordings from other media.
Export / Import
Import, edit, and combine sound files. Export your recordings in many different file formats, including multiple files at once.
Supports 16-bit, 24-bit and 32-bit. Sample rates and formats are converted using high-quality resampling and dithering.
Support for LADSPA, LV2, Nyquist, VST and Audio Unit effect plug-ins. Effects can be easily modified in a text editor – or you can even write your own plug-in.
Easy editing with Cut, Copy, Paste and Delete. Also unlimited sequential Undo (and Redo) in the session to go back any number of steps.
Real-time preview of LADSPA, LV2, VST and Audio Unit (macOS) effects. Plug-in Manager handles plug-in installation and addition/removal of effects and generators from the menus.
Tracks and selections can be fully manipulated using the keyboard. Large range of keyboard shortcuts.
Spectrogram view mode for visualizing and selecting frequencies. Plot Spectrum window for detailed frequency analysis. Support for Vamp analysis plug-ins.
If you want to remove the nosie from an audio file, or level the audio, or basically do any kind of editing to an audio file, then this is the best application for both professionals and non-professionals.