ios - Programmatically turn off VoiceProcessingIO AGC -

I am using Apple's CoreAudio Framework to record my microphone feed. Automatic gain control seems enabled by default:

  kAUVoiceIOProperty_VoiceProcessingEnableAGC indicates that automatic gain control is enabled (any non-pricing value) or disabled (value of 0) Is capable of form. The value is to read / write UINT 32 on the global audio unit area. Available in OS X v10.7 and later. Declared in AudioUnitProperties.h   
 How can I programmatically stop the AGC in CoreAds?   
 
 
 Assume that you  voiceprocessor   
  UInt32 is using an AUVoiceProcessor Audio Unit named turnoff = 0; Audio UNNet ProPorty (Voice Processor, KUIvoiceOoProperty_VisProsaging ANALACC, QDOUnitScope_GLOBAL, 0, and Turnoff, Safeoff (Turnoff));   
 Quick Details: What is doing this is setting  Properties  on 0 on the audio unit, which in this case disables AGC in the audio units usually There are two sets of controllable values ​​named  Properties  and  Parameters . You can assign these values ​​to  AudioUnitSetProperty ()  /  AudioUnitGetProperty ()  And  AudioUnitSetParameter ()  /  can be set / received using the AudioUnitGetParameter () accordingly  accordingly.  
 Note: You should probably check the  OSStatus  code that  AudioUnitSetProperty ()  returns (this will be equal to  noErr  if There was no error).