Sri N.V.S Sir,

Thank you for finding these videos for us. Each one is an excellent demonstration... I think my postings would be more effective if I accompany that with an audio or video. I'll try to produce one from the next post.

The video, titled: placement of 22 shruthis in a harmonium, excellently explains all the shruthi levels. A common doubt that arises here is that I have mentioned only 12 shruthi levels (corresponding to 12 swara sthanas) whereas the video tells there are 22 shruthis. The 5 vikruthi swaras Ri, Ga, Ma, Dha, Ni, with two variants each, gives rise to 10 swara sthanas. The fine-tuning of the 10 swarasthanas divides each into 2 sound levels, hence 10 becomes 20. This plus 2 prakruthi swara sound levels make a total of 22 shruthis.

In my post, I have made a note as to +/- 0.25 fine-tuning can be made to the pitches. As you follow the video, you can see there is only a minute difference between say Athi Komal Rishabh (R1 - 1.5 kattai) and Komal rishabh (1.75 kattai). The difference is not so evident unless the listerner's ears are very sharp

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Basic models of electronic Shruthi box and Tampuras give only the 12 shruthis. Advanced models have options to attain all 22 shruthis.

Hope this is helpful.