Friendly interface allows to perform the following operations:
Conversion of different types of audio files
Easy to use (just one click of a mouse)
Automatically normalizes MP3s to a consistent volume level.
Convert multiple audio files at once.
Registered users get at least 1 year of free upgrades.
audio converter Pro supports all the popular audio file formats:
WAV PCM;
compressed WAV (ADPCM,
gsm,
dsp, A-LAW, U-LAW, ALF2 and others);
MP3 (MPEG Layer-3);
VOX (Dialogic ADPCM);
WMA (Windows Media Audio);
RAW (PCM, A-LAW, U-LAW);
Ogg Vorbis;
WMA (Windows Media Audio).
MP4 Converter
6.4 MB 
$ 29.9