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Local Chord Corruption Is Not Recognizer Replay: Chord-Condition Propagation in MIDI-SAG

2026-09-03 09:32:15
Weiwen Huang
arXiv_SD
         
Abstract

Synthetic chord corruption provides a controlled stress test for singing accompaniment generation (SAG), whereas complete automatic chord recognition (ACR) replay measures the condition delivered to a deployed system. We compare them by replaying CNN-CRF and DeepChroma+CRF predictions through one fixed MIDI-SAG generator, holding track, seed, context, and scoring window constant. Across 30 paired tracks and three seeds, a central four-second tritone produced larger changed-target and inside-output effects than CNN-CRF replay in STFT, CQT, and CENS; the CENS target gap was positive on 29/30 tracks (mean 0.462). Matching replay support and relation composition reduced this mismatch, with joint matching giving the lowest replay distance in the full-30 analysis. Relative-root substitutions produced 2.88-fold larger CENS full-window output change than same-root quality flips at near-equal dose. The matched surrogate was closer to replay for both recognizer paths. We conclude that localized corruption tests mechanisms, whereas complete replay evaluates deployed chord-condition propagation.

Abstract (translated)

URL

https://arxiv.org/abs/2609.03584

PDF

https://arxiv.org/pdf/2609.03584.pdf

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