Dexster is the perfect audio editing tool for music production and supports many popular audio formats, including WAV and MP3. Its easy-to-use interface lets you edit audio file visually with functions such as cut,copy, paste, and mix. Among the huge range of effects you can add are amplify, delay, envelope, equalizer, expander, fade, flanger, invert, normalize, phaser, reverb, reverse, stretch and vibrato.
Try Dexster Audio Editor
The trial version will allow you to test the software before you buy it.