Answer:
A red drum which sounds without being touched, and grows silent, when it is touched.
What has roots as nobody sees, is taller than trees. Up, up it goes, and yet never grows?
A hill full, a hole full, yet you cannot catch a bowl full.
What English word retains the same pronunciation, even after you take away four of its five letters?
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?