I have been using MP3Gain for years now to adjust the volume of my MP3 collection. I often burn random selections of tracks to a CD for playback in the car and it’s really annoying if you have to change the volume with every song. With MP3Gain you can analyse and adjust the volume of MP3 files to the same level. 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.