Free Audio Dub is simply the quickest way to edit audio files. It is an application that´s totally free for editing sound, that lets you eliminate the parts you don´t want from any audio file, without having to recode it.
This means, in reality, that you don´t lose any quality. And the file conversions without losing quality are quite quick. Free Audio Dub has support for the following audio formats: MP3, WAV, AAC, AC3, M4A, MP2, OGG, WMA.
The program interface is simple, and its working too. Just indicate the entry file, the name of the file you want to obtain as a result, and manipulate the controls to select the fragment you want to process. Then just click on Convert.