Disable Automatic Gain Control (Core audio)

Hi everyone,

I'm working on an app that needs to record audio in busy environments. On iOS I'm running into an issue that I think is caused by the automatic gain control functionality in the CoreAudio framework. The device's microphone sensitivity seems to be automatically adjusted in louder environments, sometimes to the point where it doesn't pick up speech directed at the device. As my implementation relies on amplitude thresholds to determine if an audio clip should be saved, this gain adjustment causes the app on iOS to discard audio that should be accepted (and is on Android and standalone builds in the same scenario).

Does anyone know if it's possible to disable the AGC functionality from within Unity? The only relevant post I can find is this one on stackoverflow: http://stackoverflow.com/questions/15644871/programmatically-turn-off-voiceprocessingio-agc

Cheers!
Ronan