Thanks for answering my previous comment, my question is:

Can you explain a little, why there is an advanced and a beginner track?

Could you tell me a bit about yhe differentiation between the 2 tracks, and the differences about how it effects begginers or advanced binaural listeners
The "Advanced" tracks go into the Delta range faster, deeper, and for a longer period than the Beginner tracks. Binaural beats affect everybody differently; some people who try "Advanced" right away report headaches and nightmares, whereas others can jump right in without any problems.
Victor Mayer