{
  "goal": "Start the retained diagnostic tone one second earlier and keep its linked timing label aligned.",
  "preserve": [
    "sourceStart 1.0 seconds",
    "sourceDuration 3.0 seconds",
    "playbackRate 1",
    "six-second visual slate",
    "source media bytes"
  ],
  "acceptance": {
    "audioProjectRange": [
      1,
      4
    ],
    "captionProjectRange": [
      1.25,
      3.5
    ],
    "sourceRange": [
      1,
      4
    ]
  },
  "limitations": "Synthetic timing example, no speech, automatic story selection, voice synthesis or browser playback test."
}