The Free Sound Editor
 
  To download: http://audacity.sourceforge.net/download/
 
 
 
  • Record live audio.
  • Edit sound files.
  • Cut, copy, splice or mix sounds together.
  • Change the speed or pitch of a recording.
  • and much more if needed...
  To open a sound file in Audacity, open Audacity > select File menu >open Project Menu > Import Audio
 
  Select your file from within the dialogue box, then click Open