One. Vachaka (Vachik): The verbal or audible recitation is called vachaka. It requires the practitioner to chant the mantras out loud, participating the mind and speech. The audio vibrations are believed to purify the brain as well as the environment. Therefore, it is commonly used in team chants or kirtans.  https://andrevkwis.digitollblog.com/30921531/5-simple-statements-about-mantra-explained