( The following is quoted from Moni babu’s memoirs . This site neither recommends this process nor assumes any responsibility in this matter )
Practising Sa Re Ga Ma with Tanpura or Harmonium is secondary. Primary thing is to train the voice.
My voice training practice was mostly done while standing in neck-deep water in a pond. Nobody had asked me to do this. Bipin Babu had casually mentioned to me that in olden days people used to do this. I took the hint and started doing it on my own. This may not be practical in today’s life. But if somebody can afford to do it, I would definitely recommend this process.
Early morning ,preferably around 4:30 -5 am, stand in neck deep water with your feet firmly on the soil.
Slowly put pressure on the natural lowest pitch of your voice. Keep the voice steady. Do this for several rounds, 5 -6 minutes every day.
( To people who came to him for advice, Moni Babu used to recommend similar training for a longer time on the lowest reed on the harmonium that one could comfortably reach. With time as the reach widened, he would recommend doing it on the new lowest pitch. He used to say that as one’s reach widened on the lower side, the higher pitch would automatically open up. )