Audacity is a great audio recording and editing program compatible with most operating systems. The software lets you record live audio through a mixer or microphone; you can also import MP3, WAV, AIFF and OGG file formats -- then, digitize previous recordings, edit them and export. It comes with an array of effects, from Equalization to Bass Boost, and lets you remove superfluous background noise. There are keyboard shortcuts to optimize your workflow, too. And the best part? It comes with automatic crash recovery.

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