Osho talks about Nadabrahma Meditation:
"So in Nadabrahma, remember this: let the body and mind be totally together, but remember that you have to become a witness. Get out of them, easily, slowly, from the back door, with no fight, with no struggle. "Osho
"In a mantra meditation – nadabrahma or any chanting – this is how the mechanism works: when you start chanting a sound – and any sound will do; even abracadabra – if you start resounding inside, the body starts responding. Sooner or later a moment comes when the body and the mind are both together in one direction for the first time. When body and mind are both together, you are free from the body and the mind – you are not torn apart. Then the third element which you are in reality – call it soul, spirit, ‘atma’, anything – that third element is at ease because it is not being pulled in different directions."
Osho, The Buddha Disease, Chapter #31