AthTek Free Voice Changer can flexibly change the voice pitch of an existing audio file from -1 to +1 octave. It can also change the playing speed of the audio file to be fast or slow. It supports to import many types of audio file such as *.wav, *.wma and *.mp3. It also supports to export audio files with funny sound effects to *.wav files. With a recording of your voice, it can change your voice to be male or female effortlessly.