[
  {
    "mode": "leaves",
    "author": "Borgory",
    "source": "https://freesound.org/people/Borgory/sounds/751473/",
    "preview": "https://cdn.freesound.org/previews/751/751473_801011-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "processing": "Up to 60 seconds; high-pass 35 Hz; loudness normalized to -22 LUFS; stereo MP3 160 kbps."
  },
  {
    "mode": "wind",
    "author": "jordir",
    "source": "https://freesound.org/people/jordir/sounds/360568/",
    "preview": "https://cdn.freesound.org/previews/360/360568_501389-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "processing": "Up to 60 seconds; high-pass 35 Hz; loudness normalized to -22 LUFS; stereo MP3 160 kbps."
  },
  {
    "mode": "birds",
    "author": "Magnesus",
    "source": "https://freesound.org/people/Magnesus/sounds/723913/",
    "preview": "https://cdn.freesound.org/previews/723/723913_2008500-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "processing": "Up to 60 seconds; high-pass 35 Hz; loudness normalized to -22 LUFS; stereo MP3 160 kbps."
  },
  {
    "mode": "waves",
    "author": "richwise",
    "source": "https://freesound.org/people/richwise/sounds/475350/",
    "preview": "https://cdn.freesound.org/previews/475/475350_1481531-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "processing": "First 60 seconds; 65 Hz highpass, 7000 Hz lowpass, -25 LUFS, -6 dBTP ceiling, stereo 44100 Hz MP3.",
    "recording_note": "Author describes an early morning beach with no people. Replaces the previous recording after a speech-like sound report; speech in the previous recording was not confirmed."
  },
  {
    "mode": "stream",
    "author": "VKProduktion",
    "source": "https://freesound.org/people/VKProduktion/sounds/231536/",
    "preview": "https://cdn.freesound.org/previews/231/231536_4034520-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "processing": "Up to 60 seconds; high-pass 35 Hz; loudness normalized to -22 LUFS; stereo MP3 160 kbps."
  },
  {
    "mode": "cafe",
    "author": "Talitha5",
    "source": "https://freesound.org/people/Talitha5/sounds/509950/",
    "preview": "https://cdn.freesound.org/previews/509/509950_4458028-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "processing": "Up to 60 seconds; high-pass 35 Hz; loudness normalized to -22 LUFS; stereo MP3 160 kbps."
  },
  {
    "mode": "rain-light",
    "author": "YostPeter",
    "source": "https://freesound.org/people/YostPeter/sounds/523405/",
    "preview": "https://cdn.freesound.org/previews/523/523405_8448725-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "processing": "First 60 seconds of public HQ preview; 140 Hz highpass, 6500 Hz lowpass, -27 LUFS target, -6 dBTP ceiling, stereo 44100 Hz MP3."
  },
  {
    "mode": "rain-dense",
    "author": "Legnalegna55",
    "source": "https://freesound.org/people/Legnalegna55/sounds/553390/",
    "preview": "https://cdn.freesound.org/previews/553/553390_10485775-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "processing": "First 60 seconds of public HQ preview; 140 Hz highpass, 6500 Hz lowpass, -27 LUFS target, -6 dBTP ceiling, stereo 44100 Hz MP3."
  },
  {
    "mode": "fire",
    "author": "Sadiquecat",
    "source": "https://freesound.org/people/Sadiquecat/sounds/707262/",
    "preview": "https://cdn.freesound.org/previews/707/707262_5287430-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "processing": "100 Hz highpass, 6500 Hz lowpass, -25 LUFS, -6 dBTP ceiling, stereo 44100 Hz MP3."
  },
  {
    "mode": "space",
    "author": "Key Garden",
    "type": "synthesized soundscape",
    "source": "scripts/make-space-score.py",
    "description": "Original evolving SF ambient score: eight phrases, moving harmonies, irregular FM glass notes, stereo echoes and slow pitch ribbons. No voice samples; not a field recording.",
    "processing": "96 seconds; 35 Hz highpass, 9000 Hz lowpass, -25 LUFS, -6 dBTP ceiling, stereo 44100 Hz MP3."
  },
  {
    "mode": "underwater",
    "author": "Key Garden",
    "type": "synthesized soundscape",
    "source": "scripts/make-ambient.py",
    "description": "Designed ambience generated from oscillators and filtered noise; no voice samples; not a field recording.",
    "processing": "60 seconds; -25 LUFS, -6 dBTP ceiling, stereo 44100 Hz MP3."
  },
  {
    "mode": "train",
    "author": "SKrafft",
    "type": "processed recording",
    "source": "https://freesound.org/people/SKrafft/sounds/681372/",
    "preview": "https://cdn.freesound.org/previews/681/681372_5752443-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "description": "Actual interior recording on the Soller-Palma railway in Mallorca, captured with a Sony PCM-D100. The recordist describes almost no passenger sounds. Natural rail and carriage rhythm retained; harsh upper frequencies softened. Replaces archival Hollywood audio whose underlying rights were not verified.",
    "processing": "Excerpt from 8s for 120s; highpass=f=40,lowpass=f=4800,equalizer=f=220:t=q:w=0.8:g=1.5,equalizer=f=2600:t=q:w=0.8:g=-3,loudnorm=I=-26:TP=-8:LRA=9; stereo 44100 Hz MP3 160 kbps. Existing 1.5-second runtime loop crossfade retained; original playback speed preserved.",
    "license_checked": "2026-10-07",
    "original_download_sha256": "5e6bc215031bd97816263574343ed63c606f53971445141983492f341ba3bc5b"
  },
  {
    "mode": "night",
    "author": "Martin.Sadoux",
    "type": "processed recording",
    "source": "https://freesound.org/people/Martin.Sadoux/sounds/422582/",
    "preview": "https://cdn.freesound.org/previews/422/422582_8177280-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "description": "Quiet rural night in Larzac, France, with distant crickets. Field recording, not synthesized insect chirps; not a recording of a Korean village.",
    "processing": "Excerpt from 2s for up to 75s; highpass=f=70,lowpass=f=10000,loudnorm=I=-31:TP=-9:LRA=10; stereo 44100 Hz MP3 160 kbps. Runtime crossfades loop ends and preserves playback rate."
  },
  {
    "mode": "cabin",
    "author": "Borgory",
    "type": "processed recording",
    "source": "https://freesound.org/people/Borgory/sounds/728737/",
    "preview": "https://cdn.freesound.org/previews/728/728737_801011-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "description": "Actual storm wind whistling through a door, presented as a snowbound cabin soundscape. The source does not establish literal snowfall or a wooden cabin.",
    "processing": "Excerpt from 15s for up to 75s; highpass=f=45,lowpass=f=6500,equalizer=f=300:t=q:w=1:g=2,loudnorm=I=-24:TP=-6:LRA=12; stereo 44100 Hz MP3 160 kbps. Runtime crossfades loop ends and preserves playback rate."
  },
  {
    "mode": "pencil",
    "author": "leonelmail",
    "type": "processed recording",
    "source": "https://freesound.org/people/leonelmail/sounds/461702/",
    "preview": "https://cdn.freesound.org/previews/461/461702_4437257-hq.mp3",
    "license": "CC0 1.0",
    "license_url": "https://creativecommons.org/publicdomain/zero/1.0/",
    "description": "Actual pencil writing fast on paper. Preserve the natural uneven writing strokes; no oscillator/noise substitute.",
    "processing": "Excerpt from 0.4s for up to 32s; highpass=f=100,lowpass=f=9500,loudnorm=I=-22:TP=-6:LRA=8; stereo 44100 Hz MP3 160 kbps. Runtime crossfades loop ends and preserves playback rate."
  },
  {
    "mode": "spaceship",
    "author": "Key Garden",
    "type": "synthesized soundscape",
    "source": "scripts/make-extra-scenes.py",
    "description": "Designed machinery bed, turbine motion and sparse electronic signals; not a field recording.",
    "processing": "60 seconds; -25 LUFS, -6 dBTP ceiling, stereo 44100 Hz MP3."
  }
]