{"id":"chopin-prelude-op28-4","status":"provisional","review":{"by":null,"date":null,"scope":""},"source":{"title":"Prelude in E minor, Op. 28 No. 4","edition":"Peters, Herrmann Scholtz, 1900b","encoder":"Roland Goretzki","url":"https://www.mutopiaproject.org/cgibin/piece-info.cgi?id=921","license":"Public Domain","licenseUrl":"https://www.mutopiaproject.org/legal.html#publicdomain"},"tuningHz":444.09,"method":"Public-domain LilyPond/MIDI → voice-aware performed event table; tuning estimated with librosa; Sync Toolbox 1.4.2 memory-restricted multiscale DTW at 50 frames/s, chroma + DLNCO. First/last attacks anchored by score-pitch energy rises in documented inspection windows; section anchors refined by DTW and checked against existing passage labels. Note-offs are warped notation, not measured key releases; final written holds extend to an estimated decay threshold. No aural review. See tools/align/REPORT.md.","voices":[{"id":"upper","name":"Piano — upper staff"},{"id":"lower","name":"Piano — lower 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the pickup, then printed bars 1–25 once; returns are written out, with no inserted repeat."}