The volume level can be memorized for each track and allows you to define an amplitude of +/-96db giving a maximum volume range of 192db for each track.
Results are displayed clearly on your screen so you can easily move songs to playlists, view play history, manipulate playback parameters, edit id3 tags, or any one of several other tasks in a per track or batch basis. The biggest advantage of a music library database is that you can filter, sort, and group your songs in realtime.
It isn't just the music you have, it is how easy you can find it and play it.