i-DeClone actually "listens" to the beginning of each song, then uses advanced spectral fingerprints to discover similar songs by the way they sound, regardless how they are called, tagged or encoded.
Step by step instructions:
➀ Connect devices to scanIf you want to scan external disks, connect them, or just scan your PC folder contents. Click on Start scan toolbar button to begin. Then click Start new project to setup scan settings from scratch.
➁ Scan options
First setup the options for a 90% similarity search for Music, scanning your entire PC as seen in the
Then click on Advanced property page and set it up as in the picture to the right. Most things are left at default settings: see how Length (duration) is the only property used for preliminary comparison. Make sure you tick Compare file content, then audio files that are close enough in duration will be opened and compared "musically"
For more thorough coverage, you can (optionally) untick Files must have same extension. This will discover similar songs saved in different formats (e.g. SOME-SONG.MP3 and SAME-SONG.WMA). Otherwise i-DeClone only compares items of the same type (SOME-SONG.MP3 and SAME-SONG.MP3)
All set, click Start scan and wait for the results.
➂ Mark and remove duplicatesUse the checkboxes to mark duplicate items for removal, then remove them to clean up space. Use Mark wizard to choose the originals (which will be kept) depending e.g. on their folder location. Finally click Clean-up button to start deleting the marked duplicates. This is a standard procedure explained in detail in the documentation
For varying quality music in particular, mark wizard has options that let you choose which version to keep, so you can go for bigger files (better quality) or for smaller files (not as good quality but taking less space)