MP3 audio files can be edited using audio editing software, taking adobe audition3.0 as an example:

1: Run adobe audition and open the audio file to be edited in a single track;

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2: Hold down the left mouse button to select the unwanted waveform, then right-click on the selected waveform - Delete (you can also press the DEL key on the keyboard to delete);

3: To copy To select a piece of audio, hold down the left button of the mouse to select the waveform, right-click on the selected waveform - copy, then position the pointer to the location where you want to paste, click the right button of the mouse - paste; to intercept a piece of audio, click on the waveform Hold down the left mouse button to select this waveform, right click on the selected waveform - cut, right click on the selected waveform - copy as new.

4: To adjust the sound size of a piece of audio, select the waveform, click Effects--Amplitude and Limit--Volume Standardization, fill in the percentage you want to normalize in the pop-up dialog box, and click OK button;

5: To make the head of the music fade in and the end out, click Effects - Amplitude and Limit - Amplitude/Fade, select fade in or fade out in the preset, you can also choose Amplitude and pressure limit - envelope, according to your needs, adjust the envelope node in the Adjust Envelope dialog box, and then click the OK button.

In short, Adobe Audition is an excellent audio processing software. It should be used flexibly. Practice more and you will gradually become familiar with the operation of the software. The above is purely hand-made, if you are satisfied, please adopt it in time!