One. Vachaka (Vachik): The verbal or audible recitation is recognized as vachaka. It needs the practitioner to chant the mantras out loud, engaging the intellect and speech. The sound vibrations are considered to purify the brain along with the surroundings. Consequently, it is often Employed in group chants or kirtans.  https://www.instagram.com/tantramantraaurvigyaan/