Audacity is a free audio editor. You can record sounds, play sounds, import and export WAV, AIFF, and MP3 files, and more. Use it to edit your sounds using Cut, Copy and Paste (with unlimited Undo), mix tracks together, or apply effects to your recordings. It also has a built-in amplitude envelope editor, a customizable spectrogram mode and a frequency analysis window for audio analysis applications. Built-in effects include Bass Boost, Wahwah, and Noise Removal, and it also supports VST plug-in effects.
What's new in this version:
Version 1.3.12 beta fixes cutting or deleting a region in the waveform and label track did not move the labels in advance of the cut and a hover tooltip is now provided if the Mixer Toolbar input selector cannot control the system slider for the selected input.