{
  "batch": "Audio Letters 11–15",
  "date": "2026-11-10",
  "source_zip": "Dr-Peter-Beter-HQ 02.zip",
  "source_zip_sha256": "4c3a3e3b6709184158f5016c4e31214821f2b3029e8d0a310e0cb890ccbc02c9",
  "profile": {
    "version": "PDB_AL_restoration_v2_2026-11-10",
    "cleanup_filter": "highpass=f=60:p=2,afftdn=nr=4:nf=-50:tn=1:ad=0.85:gs=10",
    "target_lufs_mono": -19.0,
    "preencode_true_peak_ceiling_dbtp": -2.5,
    "maximum_positive_gain_db": 6.0,
    "output_bitrate": "128k",
    "output_sample_rate": 44100,
    "output_channels": 1,
    "intermediate_codec": "pcm_f32le",
    "dynamic_compression": false,
    "silence_trimming": false,
    "ai_speech_reconstruction": false,
    "perceptual_listening_review": "User A/B preview pending; technical QC is not a listening review."
  },
  "summary": {
    "recordings": 10,
    "letters": 5,
    "decoded_duration_seconds": 16184.790204081633,
    "decoded_duration_hms": "04:29:45",
    "all_technical_qc_passed": true,
    "exact_sample_counts_preserved": true,
    "actual_source_and_output_hashes_verified": true,
    "embedded_artwork_bytes_preserved": true,
    "output_lufs_mono_min": -21.7,
    "output_lufs_mono_max": -19.4,
    "output_true_peak_dbtp_min": -6.2,
    "output_true_peak_dbtp_max": -3.0
  },
  "reproduction_script_sha256": "ca90aa1dbcbbd5d7ee59316aae6df5c05bf4a6cb8a694b7266583dde37cbb51e",
  "limitations": [
    "Technical validation is not subjective listening.",
    "Some hiss and hum remain; no recovery of lost source details is claimed.",
    "The noise-reduction setting is not a measurement of uniform improvement.",
    "Exact duration is measured from decoded samples, not estimated MP3 headers."
  ],
  "files": [
    {
      "id": "AL-11-P01",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 11 · Part 01 (Side A)",
      "source_filename": "Dr_Peter_Beter_AL-hq-11-Part-01.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-11-Part-01.mp3",
      "output_filename": "PDB_AL-11-P01_Restored_v2.mp3",
      "source_sha256": "486100b07d514ffd115a00b72ea496604ba5ee2a306ec8e37982b18da0264ca3",
      "source_bytes": 16673609,
      "output_sha256": "c8a21ef611469d3f795263a0fbc94d19de29dcf1992d9378079e9ea6c0c201f8",
      "output_bytes": 24704736,
      "source_metrics": {
        "integrated_lufs_mono": -20.0,
        "lra_lu": 3.7,
        "true_peak_dbtp": -6.1,
        "dc_offset": 2e-06,
        "sample_peak_dbfs": -6.105964,
        "rms_dbfs": -20.06918,
        "samples": 68070528,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1543.549387755102
      },
      "clean_metrics": {
        "integrated_lufs_mono": -20.0,
        "lra_lu": 3.7,
        "true_peak_dbtp": -4.5,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -4.545061,
        "rms_dbfs": -20.099181,
        "samples": 68070528,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1543.549387755102
      },
      "gain_db": 1.0,
      "gain_limited_by_peak": false,
      "output_metrics": {
        "integrated_lufs_mono": -19.5,
        "lra_lu": 3.7,
        "true_peak_dbtp": -4.0,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -3.978817,
        "rms_dbfs": -19.544723,
        "samples": 68070528,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1543.549387755102
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "f3c4fad6aba764febacf37d8f1b8476c1e720472b2999db1a07f58392bef98f3"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "album": "Audio Letter No. 11"
        }
      }
    },
    {
      "id": "AL-11-P02",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 11 · Part 02 (Side B)",
      "source_filename": "Dr_Peter_Beter_AL-hq-11-Part-02.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-11-Part-02.mp3",
      "output_filename": "PDB_AL-11-P02_Restored_v2.mp3",
      "source_sha256": "57807bfe849404f12fca89bb7b4744a5a02218362b207484d69727ea3fb1fa55",
      "source_bytes": 17940538,
      "output_sha256": "21754a048cbeebf89cc04b2da4ae4a129a5a1425ff8d5cd29d86dccfbaa0c26f",
      "output_bytes": 26828855,
      "source_metrics": {
        "integrated_lufs_mono": -19.6,
        "lra_lu": 3.4,
        "true_peak_dbtp": -6.1,
        "dc_offset": -2e-06,
        "sample_peak_dbfs": -6.122227,
        "rms_dbfs": -19.568449,
        "samples": 73924992,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1676.3036734693878
      },
      "clean_metrics": {
        "integrated_lufs_mono": -19.7,
        "lra_lu": 3.4,
        "true_peak_dbtp": -5.4,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -5.411485,
        "rms_dbfs": -19.598663,
        "samples": 73924992,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1676.3036734693878
      },
      "gain_db": 0.7,
      "gain_limited_by_peak": false,
      "output_metrics": {
        "integrated_lufs_mono": -19.4,
        "lra_lu": 3.4,
        "true_peak_dbtp": -5.1,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -5.142941,
        "rms_dbfs": -19.344269,
        "samples": 73924992,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1676.3036734693878
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "a7137edcaea75ff52388f1e580d64922d5f14067c58969e0bebfb6b64c4574ea"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "composer": "Dan Holt",
          "album": "Audio Letter No. 11",
          "date": "2006"
        }
      }
    },
    {
      "id": "AL-12-P01",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 12 · Part 01 (Side A)",
      "source_filename": "Dr_Peter_Beter_AL-hq-12-Part-01.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-12-Part-01.mp3",
      "output_filename": "PDB_AL-12-P01_Restored_v2.mp3",
      "source_sha256": "ef673d73507aeb0081aece626999085b362bb3ed3c880dd5968281eb115c9750",
      "source_bytes": 16630117,
      "output_sha256": "1d99041d1e6ac5bbf9dd41c83c781ef12143e51d929457a9ba3f91db48f013bc",
      "output_bytes": 24446875,
      "source_metrics": {
        "integrated_lufs_mono": -20.6,
        "lra_lu": 3.6,
        "true_peak_dbtp": -6.1,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -6.157042,
        "rms_dbfs": -21.204592,
        "samples": 67359744,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1527.431836734694
      },
      "clean_metrics": {
        "integrated_lufs_mono": -20.6,
        "lra_lu": 3.6,
        "true_peak_dbtp": -5.0,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -5.007151,
        "rms_dbfs": -21.258771,
        "samples": 67359744,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1527.431836734694
      },
      "gain_db": 1.6,
      "gain_limited_by_peak": false,
      "output_metrics": {
        "integrated_lufs_mono": -19.5,
        "lra_lu": 3.6,
        "true_peak_dbtp": -3.8,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -3.841011,
        "rms_dbfs": -20.104162,
        "samples": 67359744,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1527.431836734694
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "7ec24b801e7eb3a9842e43c50e6636191ef746ba811cac76e5bd0e86f21c2ff3"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "composer": "Dan Holt",
          "album": "Audio Letter No. 12"
        }
      }
    },
    {
      "id": "AL-12-P02",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 12 · Part 02 (Side B)",
      "source_filename": "Dr_Peter_Beter_AL-hq-12-Part-02.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-12-Part-02.mp3",
      "output_filename": "PDB_AL-12-P02_Restored_v2.mp3",
      "source_sha256": "70b4343417002bb015fc3f2c349334f45e0110a565365c818c62ea6b0d356c8b",
      "source_bytes": 18594649,
      "output_sha256": "4cca4b46b9019dab66abed5b8700b0e56cb642c24428771afcc274a975d7f3d7",
      "output_bytes": 27585748,
      "source_metrics": {
        "integrated_lufs_mono": -21.2,
        "lra_lu": 3.9,
        "true_peak_dbtp": -6.1,
        "dc_offset": -1e-06,
        "sample_peak_dbfs": -6.112085,
        "rms_dbfs": -21.571993,
        "samples": 76011264,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1723.6114285714286
      },
      "clean_metrics": {
        "integrated_lufs_mono": -21.2,
        "lra_lu": 4.0,
        "true_peak_dbtp": -5.0,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -5.021442,
        "rms_dbfs": -21.622241,
        "samples": 76011264,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1723.6114285714286
      },
      "gain_db": 2.2,
      "gain_limited_by_peak": false,
      "output_metrics": {
        "integrated_lufs_mono": -19.5,
        "lra_lu": 4.0,
        "true_peak_dbtp": -3.3,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -3.280361,
        "rms_dbfs": -19.867723,
        "samples": 76011264,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1723.6114285714286
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "1349e810ca7974ba07c5022c464417826c45fd9e40d1a65477f1688fd9b78526"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "composer": "Dan Holt",
          "album": "Audio Letter No. 12"
        }
      }
    },
    {
      "id": "AL-13-P01",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 13 · Part 01 (Side A)",
      "source_filename": "Dr_Peter_Beter_AL-hq-13-Part-01.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-13-Part-01.mp3",
      "output_filename": "PDB_AL-13-P01_Restored_v2.mp3",
      "source_sha256": "d4e291245e60ec3d9d99a8498bf0cdf184d4a4329efc236e251c8d6e01622d02",
      "source_bytes": 18330102,
      "output_sha256": "f27006fa228498f6ca3d895889901d77915f69f2bcd4104625df25e3de78b934",
      "output_bytes": 26104950,
      "source_metrics": {
        "integrated_lufs_mono": -20.4,
        "lra_lu": 3.9,
        "true_peak_dbtp": -6.0,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -6.001564,
        "rms_dbfs": -20.401772,
        "samples": 71929728,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1631.0595918367346
      },
      "clean_metrics": {
        "integrated_lufs_mono": -20.4,
        "lra_lu": 3.9,
        "true_peak_dbtp": -4.4,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -4.419611,
        "rms_dbfs": -20.458234,
        "samples": 71929728,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1631.0595918367346
      },
      "gain_db": 1.4,
      "gain_limited_by_peak": false,
      "output_metrics": {
        "integrated_lufs_mono": -19.5,
        "lra_lu": 3.9,
        "true_peak_dbtp": -3.5,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -3.479096,
        "rms_dbfs": -19.503665,
        "samples": 71929728,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1631.0595918367346
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "d22c6628ed1cd313f19a5be94ae842ce0b43263130894e03d77987e65941a54b"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "composer": "Dan Holt",
          "album": "Audio Letter No. 13",
          "date": "2006"
        }
      }
    },
    {
      "id": "AL-13-P02",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 13 · Part 02 (Side B)",
      "source_filename": "Dr_Peter_Beter_AL-hq-13-Part-02.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-13-Part-02.mp3",
      "output_filename": "PDB_AL-13-P02_Restored_v2.mp3",
      "source_sha256": "1075ca37b4ed855ad65c82a189fb1a8efe51baaeaf53b9ce8360b4f9cf5c57be",
      "source_bytes": 17592850,
      "output_sha256": "7589e6ed0cbd2db64af42c84d352c5fc934ba9d6e2ed082d27d74f1aef2884d2",
      "output_bytes": 26518296,
      "source_metrics": {
        "integrated_lufs_mono": -22.1,
        "lra_lu": 4.2,
        "true_peak_dbtp": -6.0,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -6.071908,
        "rms_dbfs": -22.334437,
        "samples": 73069056,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1656.894693877551
      },
      "clean_metrics": {
        "integrated_lufs_mono": -22.2,
        "lra_lu": 4.2,
        "true_peak_dbtp": -3.4,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -3.44365,
        "rms_dbfs": -22.390129,
        "samples": 73069056,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1656.894693877551
      },
      "gain_db": 0.9,
      "gain_limited_by_peak": true,
      "output_metrics": {
        "integrated_lufs_mono": -21.7,
        "lra_lu": 4.2,
        "true_peak_dbtp": -3.0,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -3.017896,
        "rms_dbfs": -21.935603,
        "samples": 73069056,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1656.894693877551
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "a3eb9c7a706c615e2cb127f60101f18afd1c4b7c878dc2c235b8ca619d17a172"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "composer": "Dan Holt",
          "album": "Audio Letter No. 13"
        }
      }
    },
    {
      "id": "AL-14-P01",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 14 · Part 01 (Side A)",
      "source_filename": "Dr_Peter_Beter_AL-hq-14-Part-01.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-14-Part-01.mp3",
      "output_filename": "PDB_AL-14-P01_Restored_v2.mp3",
      "source_sha256": "f8c696ded9c0448c3cbe325f293066df381b3cb3909ca4a95440c3c73589e90b",
      "source_bytes": 18046895,
      "output_sha256": "2a04b9c489958f8884564a2cb1494b8d889d66d73f57a418124633551b429ac2",
      "output_bytes": 25228021,
      "source_metrics": {
        "integrated_lufs_mono": -18.1,
        "lra_lu": 3.1,
        "true_peak_dbtp": -5.8,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -5.859691,
        "rms_dbfs": -18.96826,
        "samples": 69512832,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1576.254693877551
      },
      "clean_metrics": {
        "integrated_lufs_mono": -18.1,
        "lra_lu": 3.1,
        "true_peak_dbtp": -4.1,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -4.091462,
        "rms_dbfs": -18.996379,
        "samples": 69512832,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1576.254693877551
      },
      "gain_db": -0.9,
      "gain_limited_by_peak": false,
      "output_metrics": {
        "integrated_lufs_mono": -19.4,
        "lra_lu": 3.1,
        "true_peak_dbtp": -5.4,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -5.444167,
        "rms_dbfs": -20.341798,
        "samples": 69512832,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1576.254693877551
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "edebad9b1218ea9750b693ab36f723e4c699ddc8aca41f77281016cfc013a00b"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "album": "Audio Letter No. 14"
        }
      }
    },
    {
      "id": "AL-14-P02",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 14 · Part 02 (Side B)",
      "source_filename": "Dr_Peter_Beter_AL-hq-14-Part-02.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-14-Part-02.mp3",
      "output_filename": "PDB_AL-14-P02_Restored_v2.mp3",
      "source_sha256": "b9e7fa84582525232a7e3f8e0c61538bf91d076882af93292532f5973d1e4c32",
      "source_bytes": 16902907,
      "output_sha256": "99744fe399d09e6c0b6b91afcaac556eaf6a0fb73a37fc071e9b0ed3daa69d0e",
      "output_bytes": 25226349,
      "source_metrics": {
        "integrated_lufs_mono": -19.3,
        "lra_lu": 3.5,
        "true_peak_dbtp": -6.0,
        "dc_offset": 1e-06,
        "sample_peak_dbfs": -6.063545,
        "rms_dbfs": -19.406081,
        "samples": 69508224,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1576.1502040816326
      },
      "clean_metrics": {
        "integrated_lufs_mono": -19.3,
        "lra_lu": 3.6,
        "true_peak_dbtp": -4.7,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -4.719819,
        "rms_dbfs": -19.458645,
        "samples": 69508224,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1576.1502040816326
      },
      "gain_db": 0.3,
      "gain_limited_by_peak": false,
      "output_metrics": {
        "integrated_lufs_mono": -19.5,
        "lra_lu": 3.6,
        "true_peak_dbtp": -4.8,
        "dc_offset": 0.0,
        "sample_peak_dbfs": -4.85941,
        "rms_dbfs": -19.604106,
        "samples": 69508224,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1576.1502040816326
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "a6d76d4a79b15a3bb58c832ff63c950b50b756cfd2ab72ea7063b96e89e839f1"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "album": "Audio Letter No. 14"
        }
      }
    },
    {
      "id": "AL-15-P01",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 15 · Part 01 (Side A)",
      "source_filename": "Dr_Peter_Beter_AL-hq-15-Part-01.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-15-Part-01.mp3",
      "output_filename": "PDB_AL-15-P01_Restored_v2.mp3",
      "source_sha256": "4c28e5f6d7562594bc1a2a791c8b9c6109a37f210ea705a538c715cbdb5e7ab5",
      "source_bytes": 18616785,
      "output_sha256": "184d930780664d0ba39e751330052e656f8bbea0c6ea170e64dee169983e516d",
      "output_bytes": 26143351,
      "source_metrics": {
        "integrated_lufs_mono": -18.6,
        "lra_lu": 3.5,
        "true_peak_dbtp": -5.8,
        "dc_offset": -2e-06,
        "sample_peak_dbfs": -5.899941,
        "rms_dbfs": -21.085026,
        "samples": 72035712,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1633.462857142857
      },
      "clean_metrics": {
        "integrated_lufs_mono": -18.6,
        "lra_lu": 3.5,
        "true_peak_dbtp": -5.5,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -5.542634,
        "rms_dbfs": -21.092729,
        "samples": 72035712,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1633.462857142857
      },
      "gain_db": -0.4,
      "gain_limited_by_peak": false,
      "output_metrics": {
        "integrated_lufs_mono": -19.4,
        "lra_lu": 3.5,
        "true_peak_dbtp": -6.2,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -6.271336,
        "rms_dbfs": -21.93791,
        "samples": 72035712,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1633.462857142857
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "a7310a53e9f544141f47f4e8a7737ad16bf2c9a3f93d2680a21b3371ce03f1f2"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "album": "Audio Letter No. 15"
        }
      }
    },
    {
      "id": "AL-15-P02",
      "category": "audio_letter",
      "performer": "Peter David Beter",
      "label": "Audio Letter 15 · Part 02 (Side B)",
      "source_filename": "Dr_Peter_Beter_AL-hq-15-Part-02.mp3",
      "original_hq_path": "docs/Dr-Peter-Beter-HQ/Dr_Peter_Beter_AL-hq-15-Part-02.mp3",
      "output_filename": "PDB_AL-15-P02_Restored_v2.mp3",
      "source_sha256": "85b092aae65e69c5af0feb9dc9af82e1503d263ab862df98bdc7db6bd3b2ea6f",
      "source_bytes": 18986013,
      "output_sha256": "c45f6e702ea3c22a7f6584b4b2ecb455f604215a14299fd98a5f179b1a55d5f7",
      "output_bytes": 26249095,
      "source_metrics": {
        "integrated_lufs_mono": -19.3,
        "lra_lu": 3.1,
        "true_peak_dbtp": -5.9,
        "dc_offset": 1e-06,
        "sample_peak_dbfs": -5.901617,
        "rms_dbfs": -21.015001,
        "samples": 72327168,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1640.071836734694
      },
      "clean_metrics": {
        "integrated_lufs_mono": -19.3,
        "lra_lu": 3.1,
        "true_peak_dbtp": -4.8,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -4.839466,
        "rms_dbfs": -21.03282,
        "samples": 72327168,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1640.071836734694
      },
      "gain_db": 0.3,
      "gain_limited_by_peak": false,
      "output_metrics": {
        "integrated_lufs_mono": -19.5,
        "lra_lu": 3.1,
        "true_peak_dbtp": -4.9,
        "dc_offset": -0.0,
        "sample_peak_dbfs": -4.93304,
        "rms_dbfs": -21.178221,
        "samples": 72327168,
        "nans": 0.0,
        "infs": 0.0,
        "duration_seconds": 1640.071836734694
      },
      "checks": {
        "exact_decoded_sample_count": true,
        "finite_samples": true,
        "true_peak_at_most_minus_1_5_dbtp": true,
        "mono_44100": true,
        "mp3_128k": true,
        "original_hash_unchanged": true,
        "no_output_decoder_warnings": true
      },
      "technical_qc_passed": true,
      "package_audit": {
        "actual_source_hash_verified": true,
        "actual_output_hash_verified": true,
        "embedded_artwork_identical": true,
        "artwork_images": [
          {
            "mime": "image/png",
            "picture_type": 0,
            "description": "",
            "image_bytes": 6708,
            "image_sha256": "f67abc29ef0192cf3935744b0b552272e8c3d2763b3674465aa836a34f8bbe07"
          }
        ],
        "original_metadata_preserved": {
          "artist": "Dr. Peter Beter - hq",
          "album": "Audio Letter No. 15"
        }
      }
    }
  ]
}
