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AGC and (AEC,NS) support at Audio Unit level#313
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UInt32 bypassVoiceProcessing = self.disableAudioProcessing; CheckError(AudioUnitSetProperty(*voice_unit, kAUVoiceIOProperty_BypassVoiceProcessing, kAudioUnitScope_Global, kInputBus, &bypassVoiceProcessing, sizeof(bypassVoiceProcessing)), @"kAUVoiceIOProperty_BypassVoiceProcessing failed"); UInt32 enableAGC = self.enableAGC; CheckError(AudioUnitSetProperty(*voice_unit, kAUVoiceIOProperty_VoiceProcessingEnableAGC, kAudioUnitScope_Global, kInputBus, &enableAGC, sizeof(enableAGC)), @"kAUVoiceIOProperty_VoiceProcessingEnableAGC failed");and instantiated with
OTDefaultAudioDeviceWithVolumeControl* audioDevice = [[OTDefaultAudioDeviceWithVolumeControl alloc] initWithAGC:YES disableAudioProcessing:NO];