The mp3 music files on our hard drives are the most valuable data, the more mp3 files you have, the more demand increase, such as do volume normalization, adjust the bit rate, split mp3 files into smaller pieces for use as ringtones, etc. To meet your needs, I’ll show you 3 best free mp3 editing software ( mp3 editor ):
MP3Gain is an open source audio normalizer which is designed to analyzes and adjusts your mp3 files so that they have the same volume. It’s a good idea to make all your tracks level to the same volume before you burn audio cd from mp3 files, or copy mp3 files to your ipod. It does some statistical analysis to determine how loud the file actually sounds to the human ear. Also, the changes MP3Gain makes are completely lossless. There is no quality lost in the change because the program adjusts the mp3 file directly, without decoding and re-encoding.
Audacity is an easy to use yet powerful audio editor, with it you can record audio, edit MP3, WAV sound files, cut, copy, do sound mixing, add interesting sound effects, etc.
Mp3DirectCut allows you split mp3 files directly and easily, with this utitility you can cut, copy, paste or change the volume with no need to decompress your mp3 files for audio editing, now you could make your own ringtones!