Defined in carb/audio/AudioTypes.h

constexpr SpeakerMode carb::audio::kSpeakerModeDefault = 0

common speaker layout modes.

These put together a specific set of channels that describe how a speaker mode is laid out around the listener. a special speaker mode that indicates that the audio device’s preferred speaker mode should be used in the mixer. The individual speaker positions may not be changed with setSpeakerDirections() when using this mode.