I was born premature, diagnosed with cerebral palsy, yet
   physical therapy from 2-4 made symptoms more or less invisible
   (I was able to attend school - they just called me weird, so
   that was fine by me). One ear has no useful hearing (has to be
   jet engine loud and even then makes no sense) and the other only
   goes up to 5000 hz. I'm going on 44. Hearing never got worse but
   of course never got better. Yet, I have perfect pitch and can
   hear notes in my mind that my ears have never heard. So, I can't
   do the binaural beats. I could get some of it, but I've had to
   work with limited input mechanisms and reconstruct the world
   around me in my brain very consciously. Blind in right eye, deaf
   in left ear - it might explain why some people say I have
   synesthesia. Different brain halves activating diagonally or
   whatever to each other. I think everybody has synesthesia - I
   can hear it in how they talk, in the language they use but maybe
   they're not aware of the connections they're saying.