[
  {
    "preset_id": "deeper",
    "label": "Tiefere Stimme",
    "pitch": {"semitones": -2.5},
    "speed": {"factor": 0.97}
  },
  {
    "preset_id": "brighter",
    "label": "Hellere Stimme",
    "pitch": {"semitones": 2.0},
    "breathiness": {"amount": 0.03}
  },
  {
    "preset_id": "elderly",
    "label": "Aeltere Stimme",
    "pitch": {"semitones": -1.0},
    "breathiness": {"amount": 0.03},
    "shimmer": {"amount": 0.015},
    "dynamics": {"pause_scale": 1.3, "loud_pitch_boost": 0.5}
  }
]