type t = [
  | `Native
  | `Mono
  | `Stereo
  | `_2point1
  | `_2_1
  | `Surround
  | `_3point1
  | `_4point0
  | `_4point1
  | `_2_2
  | `Quad
  | `_5point0
  | `_5point1
  | `_5point0_back
  | `_5point1_back
  | `_6point0
  | `_6point0_front
  | `Hexagonal
  | `_6point1
  | `_6point1_back
  | `_6point1_front
  | `_7point0
  | `_7point0_front
  | `_7point1
  | `_7point1_wide
  | `_7point1_wide_back
  | `Octagonal
  | `Hexadecagonal
  | `Stereo_downmix
]

