Vedic chanting is a mantra yoga…when we vocalize a syllable,
the vital breath is discharged through the space intervening our throat,
tongue, lips, the upper and lower parts of the mouth, etc. It is then that the
syllable is voiced or the akshara-dhwani produced.
Vibrations are created in those parts of the body where the vital
breath courses through as a consequence of the akshara-dhwani.
Chanting of Vedic Mantras means only voicing such syllables
as would cause beneficent vibrations that would produce such mental states as
would lead to wellbeing in this world and the hereafter and ultimately
liberation. No other type of vibration is caused by the chanting of the
mantras.
Source - As told by Chandrasekharendra Saraswati Swami.