App: Songs deDuper Pro
Developer: 扬超 张
Genres: Musik, Dienst­programme

Songs deDuper Pro helps quickly and efficiently eliminate similar or duplicate songs in your iTunes. There are only 3 simple steps to remove the duplicate songs, and It is totally compatible with iTunes 11;

Only 3 Simple steps to Remove the Duplicate tracks in your iTunes:
 1. Scan duplicate songs - gather the duplicate tracks  into Groups based on your choice of criteria;

 2. Filter - automatically designate the single "Keeper" tracks in each duplicate Group using a variety   of versatile filtering options;

 3. Purge - purge duplicate tracks from iTunes and move the files to the trash;

IF YOU CAN'T GET DUPLICATES, PLEASE TRY TO CHANGE THE CRITERIA AND THE LIBRARY, AND SCAN AGAIN

Additional features:
   # "Fuzzy" time matching
   #  Tracks search support
   #  Simple user interface
   #  Play or stop music 
   #  case-sensitivity setting for scanning duplicate tracks
   #  Tracks sort (artist, album, name, play time, etc)
   #  Locate tracks in the finder and in the iTunes
   #  Sort tracks and view track info
   #  Visual progress feedback during operations
   #  keyboard shortcuts supported.

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If you have any problem you can contact me by 3 methods as follow: 
Email:support@hummersoftware.com; hummersoftware@gmail.com 
web: http://www.hummersoftware.com/index.php/contacts-me/ 
I will contact you as soon as possible. Thank you! 
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Release notes:
-[FIXED] Scan the whole Library by default, to get more dups.
-[FIXED] Bug fixed for filter window is always keep on top.
-[FIXED] Other minor bugs fixed.
-[Optimization]Full Compatible with latest OS X EI Capitan 
-[Optimization]Full Compatible with latest iTunes (12.3.1.23)
-[Optimization]Add illustrate on the website, you can get more help from website by click help button on the top-right now. 
http://www.hummersoftware.com/index.php/products/songs-deduper-pro/