vasanthakokilam wrote:(but R1,G1,N1,D1 as those original swaras is most probably a misinterpretation and thus a misnomer).
Arun, can you expand on this?
This is a thesis in itself

Basically the "suddha-swaras" were the original swaras of the sadja grama, which again everyone believed to originate from vedas and thus from divinity. While we do not know for sure (as in 100% sure) what the positions (swarasthanams) of these were, it seems most likely this is close to kharaharapriya except for maybe a slighly flattened ri and dha, but still in the realm of R2 and D2 rather than close to R1 an D1. This is the general interpretation of pretty much all scholars today. In my writeup on 22 sruthis, if you remember I derive the math for it - based on consonance and as little assumptions - the eventual "scale" is close to kharaharapriya. If you remember 9/8 for ri was rejected because it has a s-m type relationship with pa (and thus samvadi), but in the grama system, for sadja grama ri and pa did NOT have that. So the choice suggested (albeit offered without absolute proof) was the slighly flatter 10/9.
The suddha-swaras today add up to kanakAngi which is venkaTamakhin's mukhari (today's mukhAri itself is kharaharapriya based - and that also hints at something).
In any case, *IF* we are correct that it is not this mukAri, then how come it came it be so? So why dont R2 G2 D2 and N2 not have the "suddha" prefix?
Here is how some people think it happened (and I agree):
In the grama system of bharata, dattila, brhaddesi, sangIta ratnAkara, there was only one ri. There was also only one ga (which was just called gandhara). There were "shades" of gandhara in use like antara, but they were explicitly not raised to swara status - there is also mention of "sadharana" with gandhara, but it is not clear if it was implying a separate sthanam etc. (swaras there were defined to span a portion of octave rather than occupy a point i.e. a sthanam). Basically there was one sadja, one rishaba, one gandhara, one madhyama, one panchama, one dhaivata and one nishada that had the lofty "swara status". They each had a certain precription of # of sruthis and the sum-total added to our familiar 22.
Now, somewhere in the "hole in time" between sangIta ratnAkara and rAmamatya (discounting vidyaranya for a moment as his work came to known later through another work only), the grama systems merged, or more precisely were no longer in use. We had evolved to a single system with "sa" permanently as the tonic - how so is not precisely documented in history. Anyway, once this happened, and they started laying out the swaras (on a veena), they got the R1 (i.e. mayamalavagowla ri) as "the closest rishaba to sa". Since the early works made no mention of multiple rishabas and "the rishaba" was closest to sa at a distance of 3 sruthis (dattila defines the rishaba pretty much in these explicit terms), this R1 position now assumed that role and was treated/presumed as "suddha rishaba" and thus treated as the "lofty rishaba of the grama system".
Basically "the first rishaba" (i.e. closest to sa) was thought to be that of the grama system. The same applies to all other swaras i.e. gandhara, rishaba, dhaivata and nishada. Thus "first gandhara" was now thought to be that of the grama system and labelled suddha-gandhara. This now is the vivadhi G1. You apply the logic and see M1 (suddha-madyama), D1 (suddha-dhaivata), N1 (the vivadhi suddha-nishada).
Thus we arrive at today's R1, G1, D1 and N1 having the suddha prefix.
Note let us instead assume that S R1 G1 M1 P D1 N1 as we know today was indeed the original sadja grama, and thus our "reconstruction" of it as close to to khaharapriya is somehow wrong). Let us see if the math adds up. We first apply the prescribed sruthi intervals of the grama system to it:
S-R1 - 3 sruthis
R1-G1 - 2 sruthis
G1-M1 - 4 sruthis
M1-P - 4 sruthis
P-D1 - 3 sruthis
D1-N1 - 2 sruthis
N1-S - 4 sruthis
The numbere as quoted from bharata t hrough sArngadEva. But if we account for the actual pitch intervals, we see the following
S-R1 - 1 semitone - 3 sruthis
R1-G1 - 1 semitone - 2 sruthis
G1-M1 - 3 semitons - 4 sruthis
M1-P 2 semitons - 4 sruthis
P-D1 1 semitone - 3 sruthis
D1-N1 1 semitone - 2 sruthis
N1-S 4 semitons - 4 sruthis
We see several problems. S-R1 interval is very close to R1-G1 (both 1 semitone), but have different assignments. But worse G1-M1 is 3 semitones and is assigned the same 4 sruthis as M1-P which is only 2 semitones. IMO, Bharata's experiment is unrealizable with this spacing.
Of course on top of that you have a very highly dissonant scale (atleast per our conditioning today) as the best, pure scale

.
I was confused by G1M1 and D1N1 for Mukhari and G1M2 for varali..
I meant that venkatamakhin gives an example raga that has a g1-m1, d1-n1 combo as mukhari (the suddha-mukhari), and varALi for a raga that has g1-m2 combo.