How do DCMP, Netflix English (USA) and BBC guidance write sound-effect descriptions, and where do they differ?

All three caption only sound that matters and describe sounds rather than actions; DCMP is most prescriptive on form (lowercase bracketed source+sound, optional onomatopoeia line, participle vs third-person tense), BBC uses white caps on a separate line, Netflix lowercase brackets with detailed descriptions for plot-pertinent sounds. Curator qualifications: Guides read 2026-10-22 (live pages); no caption files authored or validated. Netflix's onomatopoeia rule not re-located by the curator's phrase search. Limitations: Guides read 2026-10-22 (live pages); no caption files authored or validated. Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://dcmp.org/learn/602-captioning-key---sound-effects-and-music",
      "note": "DCMP Captioning Key - Sound Effects and Music; BBC Subtitle Guidelines s17"
    },
    {
      "url": "https://partnerhelp.netflixstudios.com/hc/en-us/articles/217350977-English-USA-Timed-Text-Style-Guide",
      "note": "DCMP Captioning Key - Sound Effects and Music; BBC Subtitle Guidelines s17"
    },
    {
      "url": "https://www.bbc.co.uk/accessibility/forproducts/guides/subtitles",
      "note": "DCMP Captioning Key - Sound Effects and Music; BBC Subtitle Guidelines s17"
    }
  ]
}