If you want to start editing sounds and music then Fleximusic Wave Editor 2007 is a good place to start. It lets you not only play your audio files but also create them, edit them, record and add sound effects to them in MP3, WAV, RAW, AU and SND formats and many others.To each portion of music or sound you can cut or copy, insert a new file, add filters and effects (noise, echo, silence, mix channels, etc).