With Dupin you can:

• Very quickly find all sets of duplicate iTunes tracks based on your choice of criteria
• Select the "Keeper" tracks from among a number of duplicates automatically using a variety of versatile filtering options
• Consolidate the play, skip, and ratings information from all tracks in a Dupe Group to the single "Keeper" track
• Re-populate iTunes playlists replacing "non-Keeper" tracks with "Keeper" tracks
• Remove duplicate tracks from iTunes and send files to the Trash
• Audition tracks with Quick Look
• Manage intentionally duplicated tracks
• Delete duplicate "dead" tracks
• View duplicates in non-loaded libraries created with iTunes' multiple library feature
• Sort tracks and view track info
• Export a list of duplicates to a text file
• Locate tracks in the Finder and in iTunes

In addition, Dupin features:

• Compatibility with iCloud Music Library/Apple Music
• Support for Notifications
• Familiar iTunes-like interface
• Robust Documentation via the Help Menu
• Ample keyboard shortcuts
• Customizable toolbars
• Optional update checking