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I noticed a some discussion about Mantra

I understand verbal mantra to be tapas and generate heat. Is that correct?

For example a very precise Mantra that must be done in an exact way like Om namah śivāya in

Ghanapatha 108 times is definitely something that generates heat. (This is a very difficult mantra to perform correctly especially 108 repetitions)

and has its basis in pranayama rhythmic breathing

Would it be correct to say verbal mantra is Anavopaya?

Hi/Namaskara everyone,

Just wanted to share a brief note before beginning my six-month journey. I’m Jagrat, based in Bengaluru, India. I’ve completed both the introductory courses on Sarvāmnāya Tantra and will now be starting my practice. Please bear with me if my questions come up often as I move forward. I’m looking forward to learning alongside all of you and pray to the Goddess for the well-being of everyone here.

Om Namaḥ Caṇḍikāyai

P.S. If there are others here based in Bengaluru, it would be wonderful to connect. Having a saṅgha of people with similar inclinations always helps.

This, I think, applies to every chant and not necessarily any mantras associated with Sarvamnaya. I read in different places and books about chanting (doesn't matter what mantra as far as I can tell) these 1000, 10,000, 100,000 times. I believe I read it correctly that these are the numbers. That being said, I have also read that chanting out loud, mentally verbally, mentally visually are "worth" more or less depending on the action. Less for out loud and more for mentally verbally and even more for mentally visually. Is this the case, have I misinterpreted something on my readings? Thanks in advance