Audioblast is a sound editor for WAV and MP3 files that supports all the standard editing features (copy, paste, make echo, change volume etc.) as well as several special effects and a choice of graphic schemes. It also includes advanced volume adjustments and normalizing, fade-in and fade-out, and an option to add silence to the end of the track. You can mix your own tracks, adjust the speed, record audio via your microphone and more. AudioBlast comes with a synthesizer, and even a Morse code converter.
The license of this software is Freeware, you can free download and free use this audio editing software.