Audacity Linux Source Code free software for recording editing sounds.
Audacity Linux Source Code is a free, easy-to-use Audio Editor and recorder for Linux, and other operating systems. You can use Audacity to:

Record live audio.
Convert tapes and records into digital recordings or CDs.
Edit Ogg Vorbis, MP3, and WAV sound files.
Cut, copy, splice, and mix sounds together.
Change the speed or pitch of a recording.
And more! See the complete list of features.

This editor can record and play sounds and import and export WAV, AIFF, MP3, and OGG files. Edit your sounds using cut, copy, and paste features (with unlimited undo functionality), mix tracks, or apply effects to your recordings. The program 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, wah wah, and noise removal, and the program also supports VST plug-in effects. This program is open-source, and this version adds tool tips, Keyboard Shortcuts, and OGG exporting and fixes some bugs.

Version 1.2.4b has a Meter Toolbar added for monitoring volume levels during playback and recording, allows you to export multiple files at once, attempts to automatically correct latency in full-duplex recordings, and contains some bug fixes. you can free download Audacity Linux Source Code 1.3.7 now.