{
  "digits": "13579",
  "text": "1 3 5 7 9",
  "kind": "DTMF",
  "toneMs": 120,
  "gapMs": 80,
  "sampleRate": 16000,
  "seed": 2205,
  "note": "Synthetic DTMF \u2014 not speech. Ground truth for DTMF/ASR harnesses."
}