Audio Converter is a universal audio converter that is easy to use, capable of transforming all the most popular formats from one to the other(mp3, WMA...):
WAV PCM, MP3 (MPEG Layer-3), WMA ( Windows Media Audio),
ALF2, ADPCM, GSM, DSP, A-LAW, U-LAW, VOX (Dialogic ADPCM), RAW (PCM, A-LAW, U-LAW), Ogg Vorbis with only one click on the mouse.
Audio Converter normalizes mp3 files at a constant level, so that you won`t have those volume peaks. There is also the possibility to convert multiple audio files at the same time