mp3Trim is a simple and easy to use MP3 editor.
Its main advantage is that it works directly in the MP3 format without having to decode/re-encode, so it is very fast and doesn't degrade the music quality.
So, what exactly can mp3Trim do for you? mp3Trim can trim the parts that you want to discard. mp3Trim can adjust the volume - either manually or automatically (normalization) - for example, to amplify those pesky MP3s that sound too low. mp3Trim can fade-in/out (to fix abrupt beginning/ending). mp3Trim can clean up your MP3s and recover wasted disk space.