Audacity is a free, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. The interface is translated into many languages. You can use Audacity to: Record live audio. Record computer playback on any Windows Vista or later machine. Convert tapes and records into digital recordings or CDs. Edit WAV, AIFF, FLAC, MP2, MP3 or Ogg Vorbis sound files.
AC3, M4A/M4R (AAC), WMA and other formats supported using optional libraries. Cut, copy, splice or mix sounds together. Numerous effects including change the speed or pitch of a recording. Write your own plug-in effects with Nyquist.
https://www.youtube.com/watch?v=Uou2w2I9yFs
Recording
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.
Sound Quality
Supports 16-bit, 24-bit and 32-bit. Sample rates and formats are converted using high-quality resampling and dithering.
Plug-ins
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.
Editing
Easy editing with Cut, Copy, Paste and Delete. Also unlimited sequential Undo (and Redo) in the session to go back any number of steps.
Effects
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.
Accessibility
Tracks and selections can be fully manipulated using the keyboard. Large range of keyboard shortcuts
Analysis
Spectrogram view mode for visualizing and selecting frequencies. Plot Spectrum window for detailed frequency analysis. Support for Vamp analysis plug-ins.