One. Vachaka (Vachik): The verbal or audible recitation is called vachaka. It requires the practitioner to chant the mantras out loud, participating the thoughts and speech. The sound vibrations are considered to purify the brain along with the surroundings. Consequently, it is usually Utilized in group chants or kirtans.  "from https://www.instagram.com/tantramantraaurvigyaan/