# Attribution and changes

Werner Goebl (1999; repository issued2017), The Vienna 4x22 Piano Corpus, DOI https://doi.org/10.21939/4X22 . Official record https://datasets.mdw.ac.at/datasets/dataset/98ea25fa-2468-43ff-929b-3c926e163583 . License recorded there: Creative Commons Attribution4.0 International, https://creativecommons.org/licenses/by/4.0/ . Reuse here includes attribution, the license link and an explicit changes notice; no endorsement is implied.

Selected original archive members: audio/Mozart/Mozart_K331_1st-mov_p01.wav and midi/Mozart_K331_1st-mov_p01.mid. Original archives and entry SHA256/CRC are in source-provenance.json. The WAV is real stereo microphone audio of a human performer on an acoustic Boesendorfer SE290 grand piano, not audio synthesized from the MIDI. The matching MIDI records the performance hardware events. The corpus record documents the DAT/microphone recording chain. The pianist is identified only by the corpus file label p01; no identity is invented.

Our changes: choose a6s excerpt, average channels, generate a half-amplitude comparison, estimate a single clock offset, convert with an unchanged detector snapshot, independently parse and compare files, and plot note ledgers as SVG Piano Rolls. We do not claim the publisher certified this detector or its results. Raw selected source files are also offered unchanged so the crops and reference can be recreated. Hardware key releases do not annotate the complete pedal-held acoustic sound.