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Yamb is a nice tool for working with audio and video files. It supports wide variety of file formats including mp3, mp4, 3gp files.
While its a full featured tool, it lacks necessary documentation, however, this ia a very helpful video tutorial which demonstrates how to use Yamb to manipulate audio files.
Download Yamb here https://www.softpedia.com/get/Multimedia/Video/Video-Editors/Yamb.shtml