It looks like there is an AVAudioSession property which would reduce system-supplied signal processing and thus give us a more raw audio signal: https://developer.apple.com/documentation/avfoundation/avaudiosessionmodemeasurement
It looks like there is an AVAudioSession property which would reduce system-supplied signal processing and thus give us a more raw audio signal:
https://developer.apple.com/documentation/avfoundation/avaudiosessionmodemeasurement