Some bpms will have changed from previous bpm analysis - for the better.
What are you seeing l? Exact half’s and doubles of the expected BPMs ?..
Check the ID3 metadata tags to see if it contains a tempo or bpm tag. The algorithm will center around this value if present.
I’ve nearly finished manually checking my main club library after 1.5 reanalysis and the only tracks that haven’t been spot on in terms of BPM have been ones with incorrect metadata or where the BPM changes throughout the track.
There are issues with first beat downbeat detection but these are quick to fix and simple need the beat grid to be shifted left or right a little.
No I’m seeing a load of songs being out by around 1bpm
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