With Visual Audio Editor you can perform various operations with audio file such as displaying a waveform image of an audio file and edit the file visually.
It supports the following audio formats:
MP3, MP2, WMA,
WAV, PCM, Compressed WAV (GSM, ADPCM, DSP ALF and others),
(Dialogic ADPCM), RAW, G.726, G723, G721 ,