Mantras are only endowed with transformative ability if given in initiation (dīkṣa) in the mouth of the guru. It's not much proper pronunciation, but rather the facility with which the mantra is endowed that gives it reworking functionality. Both of those Vedic and Avestan mantras have a variety of functional https://ricardoxltah.shoutmyblog.com/35883944/getting-my-yantra-to-work