# Sources and modifications

GuitarSet1.1.0, Qingyang Xi and colleagues, https://doi.org/10.5281/zenodo.3371780, CC BY4.0: real microphone acoustic-guitar00_BN1-129-Eb_solo_mic.wav with per-string JAMS note annotation. Original public copy remains on this site at /guitar-to-midi/files/00_BN1-129-Eb_solo_mic.wav. Known timing-error report https://github.com/marl/GuitarSet/issues/5 identifies two other filenames; references are annotation-relative, not infallible acoustic truth.

Vienna4x22 Piano Corpus, Werner Goebl, https://doi.org/10.21939/4X22, CC BY4.0: real Mozart_K331_1st-mov_p01.wav recorded from a human performance on a Boesendorfer grand, with hardware key-on/key-off MIDI. Source archival provenance/hash is retained separately. Pedal/acoustic decay is not the reference note duration. Fixed audio-minus-MIDI offset-0.63375s is inherited from source-only first-attack calibration and not refitted to new outputs.

Modifications2026-11-14: declared crops, mono mix, common0.35 gain; controlled5Hz/30-sample periodic time warp, three declared delayed taps, seeded added white noise, and a controlled sum of the two real performances. The vibrato effect and mix are deliberately constructed variants, not claims of natural player vibrato, a natural reverberant room, or an original full-band recording. No synthesized instrument replaces these recordings. All cases reuse recordings previously disclosed on the site, not new independent performances. No endorsement by dataset authors.