Cool Audio Editor is a strong audio editing tool that enables you to create, filter, apply effects, edit and convert audio files.You can combine, copy, mix, insert, and do audio operations easily.
You also can apply filters to a selected part of an audio file; reduce vocals; mix stereo channels; play an audio file or any part of it; and convert an audio file from one format to another; merge audio files.
Cool Audio Editor supports many audio formats, including WAV, MP2, MP3, VOX, WMA, raw audio, MPC, AVI, Audio CD, Ogg Vorbis, G.721, G.723, G.726, AIFF, and AU.

The license of this software is Free Trial Software, the price is $34.95, you can free download and get a free trial.