i tell you practically and scientifically.
The tamils will talk from the lip. This is followed mostly all south indian languages. please i request not to mistake me, and to be frank with you, all other languages barring south india, and english, the hindi, punjabi etc.,languages are coming from stomach. Naturally, the sound will be more.
example: There are four ka, ga, gha, and another ghaa in hindi, whereas we will have only one ka. If the hindi speaking come with gha, the sound will be more. There are such 4 letters cha, ja, etc.,in hindi.