[
  {
    "type": "speed",
    "params": {
      "min_speed_rate": 0.9,
      "max_speed_rate": 1.1,
      "num_rates": 3
    },
    "prob": 0.0
  },
  {
    "type": "shift",
    "params": {
      "min_shift_ms": -5,
      "max_shift_ms": 5
    },
    "prob": 1.0
  }
]