{
  "gpio": {
    "hook_pin": 17,
    "hook_pressed_state": "LOW",
    "extra_button_enabled": true,
    "extra_button_pin": 27,
    "extra_button_pressed_state": "LOW"
  },
  "audio": {
    "device_index": 1,
    "chunk_size": 1024,
    "format": "paInt16",
    "channels": 1,
    "sample_rate": 48000,
    "max_record_seconds": 300
  },
  "paths": {
    "base_dir": "./rotary_phone_data",
    "recordings_dir": "recordings",
    "sounds_dir": "sounds"
  },
  "backup": {
    "enabled": true,
    "usb_paths": [
      "/media/usb0",
      "/media/usb1"
    ],
    "verify_crc": true,
    "backup_on_write": true
  },
  "web": {
    "port": 8080,
    "max_upload_size_mb": 50
  },
  "system": {
    "active_greeting": "dialtone.wav",
    "extra_button_sound": "button_sound.wav",
    "beep_sound": "beep.wav",
    "beep_enabled": true,
    "greeting_delay_seconds": 0,
    "volume": 70,
    "volume_greeting": 70,
    "volume_button": 70,
    "volume_beep": 70
  }
}