Hi Erwan --
I'm glad you're doing so well with holosync. I think that's the important thing.
To answer your questions: I did complete all thirteen levels. When I wrote my original post, I inadvertantly said I'd completed 12+ years, when I'd meant to say 12+ levels. I did the program in 8 to 9 years -- followed the guidelines I'd been given. Apparently the guidelines for time have changed since I participated, been lengthened for some of the levels. Also, for much of my time on the program, I listened for 2 hours a day.
The higher levels are the same, except for the carrier frequencies.
During my years on holosync, I was in therapy with a psychologist, who is also a Buddhist teacher. He helped me through the periods of overwhelm, taught me various releasing techniques.
I hope this is helpful. My best to you.
Cilla