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A practice on the sense door of hearing, sound, using external sounds and moving inwards to refine the internal nadam (sounds). Concentration on sound, and mantra sounding, have ability to "cut the mind," where thoughts are lessened, and deeper experience of being may be felt. Nadam is a very effective tool for deepening awareness, transformation of consciousnes and developing meditation to a very subtle level. The mantras used in this practice are "Om" and "Soham."