[
  {
    "preset_id": "female_to_male",
    "label": "Weiblich → Maennlich",
    "pitch": {"semitones": -4.0},
    "speed": {"factor": 0.95}
  },
  {
    "preset_id": "female_to_girl",
    "label": "Weiblich → Maedchen",
    "pitch": {"semitones": 3.5},
    "breathiness": {"amount": 0.02},
    "dynamics": {"pause_scale": 0.85}
  },
  {
    "preset_id": "female_to_boy",
    "label": "Weiblich → Junge",
    "pitch": {"semitones": 2.5},
    "formant": {"shift": -0.03},
    "dynamics": {"pause_scale": 0.8},
    "trim": {"rtrim": 0.04}
  }
]