{
  "schema": 1,
  "purpose": "Bounded test for score-locked stereo voice allocation; not a hidden-message extraction.",
  "inputs": {
    "audio": {
      "path": "audio-48khz-stereo.wav",
      "sha256": "84f98f6b3d96ca6a5c33777b161542bcb7bc8c48cbd18fe417a026a80fd855cc",
      "sample_rate_hz": 48000
    },
    "midi": {
      "path": "mutopia-contrapunctusI.mid",
      "sha256": "9d051a6938b09571846983281c2c7e14a447659e8bf0c74724ce6e07c4070528",
      "midi_tracks_total": 7,
      "voice_tracks_used": [
        1,
        2,
        3,
        4
      ],
      "ticks_per_beat": 384,
      "note_count_per_voice": {
        "1": 244,
        "2": 253,
        "3": 214,
        "4": 187
      },
      "last_note_seconds": 156.0
    },
    "timing_audit": {
      "path": "timing-audit.json",
      "sha256": "1f213bd4d3435a9df765e79a29bbdbaba978bc46bb5e8fa5e90b8b45482eac38",
      "preselected_alignment": {
        "semitone_shift": 0,
        "mean_chroma_cosine": 0.5822194735052558,
        "time_scale": 1.139999999999996,
        "offset_seconds": 0.0,
        "selected_frame_coverage": 0.9518716577540107
      }
    }
  },
  "method": {
    "audio": "4096-sample Hann STFT, 55\u20133520 Hz bins folded to twelve normalized pitch classes for left, right, mid, and side signals.",
    "score": "four MIDI voice tracks represented as simultaneous pitch-class vectors; every nonempty voice subset is tested.",
    "time_mapping": "score_seconds = (video_seconds - offset_seconds) * time_scale, taken unchanged from timing-audit.json.",
    "selection": "0.25-second frames within score range and above the 25th percentile of mid-channel chroma energy.",
    "partition_test": "For each of seven unique complementary voice partitions, compare L\u2192A/R\u2192B against L\u2192B/R\u2192A. The statistic is the maximum absolute preference.",
    "control": "200 fixed-seed common circular shifts of both audio channels against the score, with maximum partition selection repeated for every shift."
  },
  "evaluation": {
    "grid_step_seconds": 0.25,
    "grid_frames": 580,
    "selected_frames": 411,
    "score_range_frames": 548,
    "mid_energy_threshold": 1.5442540841351038
  },
  "voice_registers": {
    "1": {
      "minimum_midi_note": 61,
      "maximum_midi_note": 82,
      "mean_midi_note": 71.72540983606558
    },
    "2": {
      "minimum_midi_note": 53,
      "maximum_midi_note": 77,
      "mean_midi_note": 65.49407114624506
    },
    "3": {
      "minimum_midi_note": 49,
      "maximum_midi_note": 69,
      "mean_midi_note": 57.73364485981308
    },
    "4": {
      "minimum_midi_note": 38,
      "maximum_midi_note": 62,
      "mean_midi_note": 49.64171122994652
    }
  },
  "stereo_register_check": {
    "left_median_spectral_centroid_hz": 1228.4379130412026,
    "right_median_spectral_centroid_hz": 850.4835991426493,
    "right_minus_left_median_hz": -377.9543138985533,
    "interpretation": "The centroid is reported as a diagnostic only. Here it runs opposite to the simplest high-register/right-channel panning explanation, so the chroma preference should not be assigned a physical cause without a note-level panning audit."
  },
  "channel_subset_results": {
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          ],
          "zero_shift_cosine": 0.6792170566243916,
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          "zero_shift_rank_of_12": 1
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          ],
          "zero_shift_cosine": 0.6391684464256349,
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          "zero_shift_rank_of_12": 1
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  },
  "derived": [
    "stereo-voice-audit.png",
    "stereo-voice-control-null.png",
    "stereo-voice-audit.md"
  ],
  "limitations": [
    "The timing map is inherited from a partial chroma audit and is not a note-perfect performance alignment.",
    "MIDI tracks are reference voices, not isolated stems from the source recording.",
    "A channel preference would not by itself establish a cipher, a textual payload, or authorial intent."
  ]
}