Here is a good exercise to develop skill in various eduppus. It is an exercise involving learning to shift the eduppu points through all the possible positions. This is a formula I'm still working on so it's still beta :
Chaturashra nadai (4 notes per beat)
1) kttk / kttk / kttk / t , k, / t, k, / t, k, /t,,, / k,,, / t,,, / k,,, / tk - kt / tk - t,, /,, - k, /,, - t , /,, - k, /,, - t , /,, - k, //Tha (End) (Samam and 1/2 positions).
How it works : Adding a tk-kttk (6 unit) pattern shifts the eduppu point by 1.5 beats allowing one to practice in 1/2 eduppu.
The next is a little harder
2) kttk / kttk / kttk / t, k, / t, k, / t, k, /t,,, /k,,, / t,,, / k,,, / t d g n /t - t, k /, t , k /, t , k / , t , k /, t , k /, t , k /, t , , /, k , , /, t , , /, k , , /,t , , /, k , , / , tkt // Tha (End) (1/4 position eduppu exercise)
How it works : Tdngt is a 5 beat battern so it shifts the eduppu from samam to 1 and a quarter beats away, essentially shifting it forward by 1/4 of a beat and allowing the quarter position eduppu. To return to samam, use a 3 beat pattern. This will shift the eduppu back by a quarter of a beat and bring it back in sync with the beat)
3) kttk / kttk / kttk / t, k, / t, k, / t, k, /t,,, /k,,, / t,,, / k,,, / tkt - t/, k ,t /, k, t /, k, t /, k, t /, k , t /, , , k /, , , t / , , , k / , , , t / , , , k / , , , t / , , , k / , , , t / d g n t //Tha (End) (3/4 position eduppu exercise)
How it works : Introducing a tkt pattern shifts the eduppu back by 1/4th of a beat, allowing the 3/4 position eduppu. To bring it back in sync with the beat, throw in a 5 note pattern, tdgnt , and then the eduppu will shift forward, bringing it back in sync. This last technique is the most commonly used pattern to end
a neraval or kalpanaswara sequence and most korvais.
One point here to note is that although I marked everything as t,,, k,,, t,,, k,,, etc... first one has to keep counting t,,, / k,,, etc... as 4 counts (@4 notes a beat), then one should count them in the next lower speed as t , / k , /t , / k , (2 notes a beat) and finally one should count even slower as t / k / t / k (1 note per beat), then go in the reverse order back to 4 counts a beat and then only finish the varsai.
It's not possible to show properly how this works in notated text when this exercise is repeated for 1/4 and 3/4 eduppus so for this a sound sample is necessary. You will find syllables criss crossing the beat as a result.
A challenge is to combine the 1/4 and 3/4 eduppu exercises. Add a tk-kttk pattern in the middle of a 1/4 eduppu exercise and the eduppu will shift to 3/4 position. Then when it's time to end, throw in a tdgnt and finish on the samam with a "Tha".
(Inspiration of this exercise : Alathoor Bros. Sankeerna Nadai Pallavi recording, which contains all these features in trikalam singing. Will notate that down too later to show it).