How to disable the software "Volume Limit" in the "Settings" menu & # 8594; "Music"

Question

I am doing several FFTs on audio data coming from an iOS microphone. I can turn off the low-pass filter by setting the mode to AVAudioSessionModeMeasurement:

success = [[AVAudioSession sharedInstance] setMode: AVAudioSessionModeMeasurement error:&audioSessionError];

However, “Volume Limit” does not allow me to make measurements predictable. And I wonder how I can automatically turn off “EQ” and “Volume Limit” for my audio session? Please recommend ... Greetings ...