src/media/audio/config/chromebook_audio_core_config.json

{
  "volume_curve": [
    {"level": 0.0, "db": "MUTED"},
    {"level": 0.01,"db": -45.0},
    {"level": 0.1, "db": -37.0},
    {"level": 0.2, "db": -30.5},
    {"level": 0.3, "db": -25.5},
    {"level": 0.4, "db": -22.0},
    {"level": 0.5, "db": -18.0},
    {"level": 0.6, "db": -15.0},
    {"level": 0.7, "db": -11.5},
    {"level": 0.8, "db":  -8.5},
    {"level": 0.9, "db":  -5.0},
    {"level": 1.0, "db":   0.0}
  ],
  "input_devices": [
    {
      "device_id": [
        "03000000000000000000000000000000",
        "03030303030303030303030303030303"
      ],
      "supported_stream_types": [
        "capture:background",
        "capture:foreground",
        "capture:system_agent",
        "capture:communications"
      ],
      "rate": 48000,
      "software_gain_db": 20.0
    },
    {
      "device_id": "*",
      "supported_stream_types": [
        "capture:background",
        "capture:foreground",
        "capture:system_agent",
        "capture:communications"
      ],
      "rate": 48000
    }
  ]
}