Good question, I wish I someone would answer this one as well. I would like to know. I think they are used to get into a trance state, but I'm not sure...
binaural beats can be used in your meditations as it helps you get into trance/hypnotic state, making it easier do your workings and programmings
--------------------------------------------
what karthikkashyap84 said....it is important to build the ability to be in full control of your abilities by yourself without any props or assistance. Dependencies tend to create other dependencies and they make you vulnerable...exactly what the enemy wants. This is war.