{
  "digits": "567890",
  "text": "5 6 7 8 9 0",
  "kind": "DTMF",
  "toneMs": 120,
  "gapMs": 80,
  "sampleRate": 16000,
  "seed": 2202,
  "note": "Synthetic DTMF \u2014 not speech. Ground truth for DTMF/ASR harnesses."
}