One thing to consder.. the audio from that video is most likly from a mic placed on the dash that is exposed to the cockpit..
Where as 'most' pilots wore helmets that covered the ears.. which also contained a head set (speaker) to the radio.. Which would reduce the cockpit noise
In short, if you want to hear what the pilots 'heard' than you need to place the mic in the helmet between the ear and ear pad
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Theres a reason for instrumenting a plane for test..
That being a pilots's 'perception' of what is going on can be very different from what is 'actually' going on.
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