Well, there have been some interesting replies.
I agree with you, the concept is to remove the dust, to return to your inner child, to lose rather then to gain.
Yesterday on another post I read about a story in which initial stages of meditation induced emotions like anger, crying, anxiety - and then the guy stopped the meditation just when he started to make some progress.
The reason I posted here about this sound is because a really cool story about a friend of mine.
He took a lot of ginseng for many years and then became ill with some autoimune disease.
The doctors prescribed him steroids (prednisone). Apparently the steroids combined with ginseng gave a really nasty effect, and he become manic for a couple of days. I know this as I visited him at the hospital.
Anyway, they released him, and after a couple of years in which he complained of constant tinnitus, I met him the other month.
He showed me this picture
He said that one day he listened to the sound of tingsha bell Meditation (see the youtube link) on loud volume, and felt that something vibrate inside of head. Then felt that something breaks into pieces and had a terrible headache for 2 days. He is a very quiet guy, but in these 2 days he said he became very agitated like being on steroids again.
And here comes the big thing: on the third day he experienced a surge of melatonin and slept like a baby, best sleep in the last 15 years.
The only reasonably explanation for this (and I agree with him) is that his pineal gland was covered with toxins (from the steroids doctors gave him). You all hear about fluoride and calcification of pineal gland.
He always felt something was there and when he went to sleep, he felt his head trembling (maybe the release of melatonin was blocked by toxins ?) . Anyway, after he heard the sound, the pineal gland which is crystal and has piezoelectric qualities, went into vibration. The things on it shattered in pieces, and he is now a changed man. No tinnitus, no disease, just cool, relaxed. He listens to the sound every day now and said it reminds him of some feeling from his childhood.
I know this guy from 5th grade so I know he's telling the truth, we're good friends.
There must be something with the sound after all, otherwise it would not be called Medicine Buddha ...
Of course this is not full Enlightenment, maybe some initial phase.
The thing is, I read a story about a Zen monk. One early morning, while he was listening to the monastery bell, he experienced the small temporary enlightenment. After many years, more experiences and meditation, had two or three experiences like this (only longer and deeper?) and then he obtained full definitive enlightenment.
So I think there must be something to this.