You may want to convert your Real Audio music to MP3/WAV; You may want to save the music from Radio Station to MP3/WAV; You may want to extract the music from the Movie to MP3/WAV; You may want to say/sing aloud to your computer's microphone and then save the sound to MP3/WAV; You may want to do more and more other audio work with your computer. All these work could be done with Audio Mp3 Sound Record software. As long as the sound through your sound card, it could be captured and saved to MP3/WAV file.