Hengis,
I am sure you're going to get people telling you (by implication or stated outright) that it's your fault. You did something wrong, you approached it improperly, etc.
It's my belief that while the technology does have some effect, the majority of the work is being done by the expectations of the people listening to the tapes. Sort of an enhanced placebo effect.
Sorta like giving someone a pill that is a very mild sedative and telling them it is a powerful tranquilizer. The little bit of sedation confirms expectations and helps them do it to themselves better.
