Which swar should be active during Mantra Chanting?

Q: When I meditate, some times I am able to do so, some times I am unable to do it. When we chant mantra which swar should move?

A: Well, meditation is being done by the mind & mind is always changing colours & hence some days you find it very quiet, some days it is very perturbed, some day it is frustrated, some day it is very agonized to sit and regarding what swar should be on when you do mantra, preferably it is the left. Left is the Ida, it means cool & restful & it provides the right kind of wave length in your body and also it will have great effect on your mind. And will provide you the right aptitude to do your mantra.