{
  "schemaVersion": 1,
  "version": "v2",
  "createdAt": "2026-10-10T10:48:08+00:00",
  "license": "CC0-1.0",
  "instrumentSamples": {
    "source": "VS Chamber Orchestra 2 Community Edition",
    "sourceUrl": "https://github.com/sgossner/VSCO-2-CE",
    "provenance": "/audio/music/kits/v1/provenance.json",
    "transformation": "The fifteen v1 PCM files are copied byte-for-byte. Original hashes, mappings, envelopes and recordings are unchanged."
  },
  "voice": {
    "createdAt": "2026-10-10T10:46:27.302257+00:00",
    "sourcePage": "https://freesound.org/people/ShangusBurger/sounds/763911/",
    "sourceUrl": "https://cdn.freesound.org/previews/763/763911_11744683-hq.mp3",
    "sourceIs": "public HQ MP3 preview, not original 96kHz24bit WAV",
    "sourceSha256": "8a94d0257ff2676e793b97a698f1cae4e99a1b016a6e8b914f6edadfeab7cad1",
    "sourcePageSha256": "6ad1264eb87b7781bafcd812a8a76db37913316f124534528dc57e2d4edd9082",
    "license": "CC0-1.0",
    "licenseUrl": "https://creativecommons.org/publicdomain/zero/1.0/",
    "author": "Shane Vincent / ShangusBurger and GameSoundCon 2024 Walla participants",
    "sourcePublished": "2024-11-06",
    "sourceRecorded": "2024-10-30",
    "sourceDescription": "Medium-sized crowd singing the vowel ɛ generally on a concert F; recorded expressly for public CC0 release.",
    "segmentStartSeconds": 1.9,
    "segmentEndSeconds": 6.6,
    "transformations": [
      "decode HQ MP3",
      "crop 1.9–6.6s",
      "mono downmix",
      "44.1kHz resample",
      "highpass70Hz and lowpass6000Hz",
      "0.18s sine-squared attack fade",
      "0.35s cosine-squared tail fade",
      "peak normalize -8dBFS",
      "PCM16 WAV"
    ],
    "outputSha256": "0e897374764e4de105f4eb44b4d83cac700af3f7c6f006c0925157e4fa7f7a1d",
    "durationSeconds": 4.7,
    "frames": 207270,
    "channels": 1,
    "sampleRate": 44100,
    "bitsPerSample": 16,
    "peakDbFS": -8.000117030469568,
    "clippedSamples": 0,
    "loop": null,
    "pitch": {
      "sourcePitchClass": "F",
      "dominantOctaves": [
        "F3",
        "F4"
      ],
      "rootMidiSuggested": 53,
      "estimatedSpectralCenterHz": 175.96435546875,
      "estimatedCentsAboveNominalF3": 13.335631158800844,
      "suggestedTuneCents": -13.34,
      "method": "30 overlapping 0.3s Hann windows at 24kHz; median peak frequency divided by partial number across first four harmonics near170–180Hz fundamental.",
      "limitation": "Real choir in octaves, varied individual tuning; no exact unique fundamental."
    },
    "recommendedRangeMidi": [
      49,
      57
    ],
    "limits": [
      "Derived from the publicly available HQ MP3 preview, not the original 96 kHz WAV.",
      "The source is a human mixed choir with room reverberation, not a solo singer or an AI voice.",
      "Pitch is a spectral estimate of a choir singing in octaves, not a claim of exact individual intonation."
    ],
    "file": "voice-53.wav"
  }
}