live system
/02 case study · sortit
1 min readprivate beta · launching q2 2026↳ getsortit.com

the truth about every track

BPM, key, audio quality. Verified locally on your Mac. Four DSP engines vote, the verdict is written back into the file. 100% classifier. Zero generative. Zero cloud.

sortit
79%
fake-lossless in our 1,000-file test
98%
bpm accuracy
90%+
key target · coreml
24
keys · camelot wheel
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A label, not an opinion. A truth, not a guess.

the problem

79% of "lossless" WAVs in our 1,000-file test were rebadged MP3s. Promo bitrates unknown. Old MP3s in the back of the collection. Drop one on a six-figure rig and the room hears it.

the discipline

Layer 1: four open-source engines vote (Essentia, Librosa, Aubio, Madmom). Layer 2: a CoreML classifier in development, built to lift key detection past 90%. SHA-256 dedup. No decoder, no generative path anywhere in the network.

the output

A file that finally tells the truth. Rekordbox, Serato and Traktor inherit the corrected tags as if the publisher had shipped them right. The library settles.