static const char kAutoGainControl[]; // googAutoGainControl
static const char kExperimentalAutoGainControl[]; // googAutoGainControl2
static const char kNoiseSuppression[]; // googNoiseSuppression
+ static const char kExperimentalNoiseSuppression[]; // googNoiseSuppression2
static const char kHighpassFilter[]; // googHighpassFilter
static const char kTypingNoiseDetection[]; // googTypingNoiseDetection
static const char kAudioMirroring[]; // googAudioMirroring