Use Audio Editor to Edit you audio files(in most common formats), make effects, apply filters, Frequency analysis, and more options.
Main features:
-Open and edit many audio files such as: MP3, MP2, WAV, WMA,OGG, VOX, G726, RAW, DSS, CDA, MPC, PCM, GSM.
-Save to many audio formats such as: MP3, WAV, VOX, OGG, G726, WMA, and RAW