Mantras are only endowed with transformative energy if given in initiation (dīkṣa) with the mouth of the guru. It's not necessarily so much right pronunciation, but alternatively the ability with which the mantra is endowed that offers it transforming functionality. Most on-line reference entries and content don't have page numbers. https://freekundli49372.luwebs.com/37623111/the-bhairav-diaries