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 PRO 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 PRO is for you.

If some of your mp3 files lacked «sound clarity», «boost or strengh», «definition», " gain Volume», «bad quality» ... then Mp3Doctor PRO 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 PRO is for you.