Audacity

Audacity is a free audio editing software that allows you to create and edit audio files. You have the capabilities of recording your own audio or editing audio from other sources. You also have the ability to export audio into a number of different formats usable on both a Mac and PC platform.

Video
Text and Images
Text Only

INSTALLING
Installing on a PC  
Installing on a Mac  
Installing MP3 Codec (PC and Mac)  
MICROPHONE
Microphone on a PC  
Microphone on a Mac  
Testing Microphone  
EXPORTING
Burn CD
Create Podcast  
Export Project
IMPORTING
Import Audio  
Record Audio From Computer  
Record Sound  
Import Files From iTunes  
 
EDITING
Amplify  
Play Selection of Audio  
Delete Selection of Audio  
Fade  
Change Pitch  
Split Track  
Envelope Tool  
Use Effects  
Zoom  
Drawing Tool  
Mix Background Music  
Normalize  
Mix Tracks  
Input Clipping  
Output Clipping