music/exemplars/instruments/NOISE_STRUCTURE_VALIDATION.json
{
"instrument": "noise_structure",
"version": "v1",
"law": "A texture may carry dozens of layers, but it must resolve into separable voices: there cannot just be stacked noise.",
"tier": "MEASURED INSTRUMENT",
"measured_at": "2026-08-07T23:10:36+00:00",
"seed": 20260807,
"legal_posture": "Analysis for understanding only. Audio lawfully obtained by Josh, read from disk, measured, and never copied, redistributed, or used as model input of any kind.",
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{
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{
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{
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{
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{
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{
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{
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{
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{
"track_id": "EX_082",
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{
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{
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{
"track_id": "EX_179",
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{
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{
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"reading": "The bar is the best-of-bank |AUC-0.5| a within-album label permutation reaches by chance, priced the way PATTERN_FINDINGS_V2 section 3 prices it. An axis that does not clear it is NOT SEPARATED, in those words."
},
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"auc_reject_over_hit": 0.813,
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{
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},
{
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],
"provenance_stratified": {
"table": [
{
"measure": "peak_stability",
"auc_vs_all_loved": 0.813,
"auc_vs_lossless_stratum": 0.5208,
"collapse": 0.2921,
"n_lossless": 16
},
{
"measure": "residual_share",
"auc_vs_all_loved": 0.2843,
"auc_vs_lossless_stratum": 0.309,
"collapse": 0.0248,
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},
{
"measure": "wall_score",
"auc_vs_all_loved": 0.3,
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{
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"auc_vs_all_loved": 0.35,
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},
{
"measure": "masked_fraction",
"auc_vs_all_loved": 0.3722,
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"n_lossless": 16
},
{
"measure": "onset_coherence",
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},
{
"measure": "voice_independence",
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"collapse": -0.0889,
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},
{
"measure": "roughness_mean",
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}
],
"n_lossless_in_subset": 16,
"codec_control": "A bitrate sweep on one generated track moved peak_stability by 0.0072 from 320 kbps to 64 kbps (0.6237 to 0.6165) and roughness by 0.0002, so the ENCODER is not the mechanism. The lossless stratum of this corpus is modern FLAC rips -- Minecraft, ULTRAKILL, Streets of Rage 2 Remastered -- and the lossy stratum is older rips of older music, so the split is a PROVENANCE proxy rather than a compression artefact. Either way it confounds the comparison and either way stratifying is the fix.",
"reading": "A measure that separates at AUC 0.8 against the whole loved set and at 0.5 against the lossless stratum has told us about file provenance, not about the music."
}
}