If every time you play mp3 files, you have to manually adjust the volume gain of each song or at least some songs, then Mp3Doctor is for you.
If you feel that when you play your collection of MP3 files, some songs sound 'different' to the rest of the mp3 files, not only in volume gain, but in the 'color','texture' or 'sound' in general, then Mp3Doctor is for you.
If some of your mp3 files lacked 'sound clarity', 'boost or strengh', 'definition', ' gain Volume', 'bad quality' ... then Mp3Doctor is for you.
If some of your mp3 files have passages with low gain in volume, sounds confusing, if it lacks the bass boost ... then Mp3Doctor is for you.
* Did your mp3 collection has different volumes or quality
* Mp3Doctor let you standardize the volume level (volume normalizer), sample rate, quality, etc. of ALL you mp3 collection with JUST ONE CLICK.
* Standarize all the mp3 that you has download from internet (Kazaa, WinMX, Morpheus, etc)
* Optimize internally every file to get the best from it.
* Let you normalize a song to avoid lower parts, now you can experience you music colletion at 100%
* Trim (delete lead - ending silence) of your Mp3s.
* Finally a complete MP3 NORMALIZER MP3 - TRIM - FIX TOOL

The license of this software is Free Trial Software, the price is $28.95, you can free download and get a free trial.