MP3 Doctor is an editing tool that lets you check, modify, and improve all your MP3 and WAV files. You can repair imperfect songs or modify them with trimming, equalizing, and resampling. The goal is to let you maintain similar quality, volume, and sound on all your existing MP3s. In addition, it converts MP3 to WAV and vice versa.
More info:
hxxp://www.mp3doctor.com.ar/