16-Bit Mono 44.1KHz .wav files are the type file supported.
You can always convert the MP3 into a WAV file format or vice versa.
Audacity is free, open source, cross-platform audio software for recording and editing sounds- it is Freeware.It works on Windows: 2000, XP, Vista, Windows 7, and Windows 8. :)
Audacity is a free, easy-to-use, multi-track audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems.
Record live audio.
Record computer playback on any Windows Vista or later machine.
Convert tapes and records into digital recordings or CDs.
Edit WAV, AIFF, FLAC, MP2, MP3 or Ogg Vorbis sound files.
Cut, copy, splice or mix sounds together.
Change the speed or pitch of a recording.
And more! See the complete list of features.
About Free SoftwareAudacity is free software, developed by a group of volunteers and distributed under the GNU General Public License (GPL).