AFTER a hard day's work, you may want to sit down and relax by listening to some light music or enchanting melodies. Some of you may prefer some rock music or a little heavy-metal. Before you can listen to different types of music and melodies recorded on CDs, a group of music production professionals have to do things such as composing, mixing and re-arranging hundreds of thousands of music drafts in order to convert them into ear-catching songs and music. Now you have the chance to try and compose your own songs, mix them and rearrange your favourite melodies in any way you like with a sound-editing programme, SoundEdit 16, introduced by Macromedia. With this program, you do not have to buy expensive musical instruments and special professional-level sound/music mixing equipment to create your own masterpiece. You only need an Apple Macintosh computer installed with any sound input hardware . . . and that is. Similar to SoundEdit Pro, SoundEdit 16 is the essential tool for users to create professional-quality audio sound clips. Its multi-track mixing capability gives users a platform to create voice-over narration, add and playback unlimited audio tracks, and save it all in one stereo file. In SoundEdit 16, there are a number of new features. For example, delay, normalise, fade-in, fade-out, and crop. All of these let you shape sounds for your sound/music production. Moreover, by using the Tempo effect, you can even shorten or lengthen your sound files to change the duration of your sound. Despite making the sound files last longer the frequency of your sound files will not be changed - a useful accomplishment.