I see your point, this is what I would suggest:
- Run Autocorrect on a small subset of data (approx 200 files), and see if you are happy with the results (at this point nothing has been saved) . If not review the preferences there are various things you can do to restrict matching further or widen matching - it all depends on how your files are organized and what you consider fixed.
i.e.
Do you want to match from Discogs and Musicbrainz or just MusicBrainz ?
Are your songs already organized one album per folder, would you consider it a good match if all songs in folder were matched to one album even if they matched an album with more tracks ?
If able to match to the right song but not to the same album as the current metadata do you want to do match or ignore ?
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Once ready you can run Autocorrecter again to match your data, and include Correct Filename from Metadata. (this will rename all files but remember nothing saved at this point)
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Review Changes
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Run File:Save if Matched to only save the files that have actually been matched.
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Close all Files, and reopen
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Review Preferences:Local Correct:Delete Duplicates and configure accordingly
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Run Action:Delete Duplicates
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Review deletions then run Save Changes to actually delete the duplicates
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Run File:Save and Move if Matched to move all the files that have been matched to a new root folder.