The noise cancelling effect is a further layer of technology over the sound that comes from the environment coupled with the subtle, but powerful effects of the binaural stimulation of Holosync products. The more layers of technology, the more complicated are the messages for the brain to unscramble. In the end you may end up in big chaos, ie very emotional and unsettled.
I know the noise on aircrafts can be unbearable. I cope with it bu using earbuds. For advanced Holosync you need headphone going down to 6 Hz frequency. They are expensive.
