Audacity is free, open source, cross-platform software for recording and editing sounds.
Audacity is an audio editing tool that allows you to record and edit audio. Besides trimming audio files and converting audio files, Audacity also has audio effects built in, so you can remix and mashup audio as much as you want. As stated on their website, Audacity supports several digital audio file formats with support for 24-bit and 32-bit sample formats as well as 16-bit. Supported formats include: WAV, AIFF, OGG, and MP3. Audacity’s Advanced features include: envelope editing, mixing of tracks, recording overdubs while playing previously recorded tracks, scrubbing (quickly navigating the waveform to find a particular event of interest), and spectral editing Lastly, Audacity includes a spectrogram mode or a spectrum analyzer window. Also Audacity has built-in effects and supports the following plug-ins (providing additional effects and processing): Audio Unit plug-ins, LADSPA Plug-ins, LV2 Plug-ins, Nyquist Plug-ins, VST Plug-ins, Vamp Plug-ins.
Audacity’s documentation is broken up into a few pieces and be accessed below.
Download Audacity here!