Rif Rosh HaShana 9b {Rosh haShana 32b continues; 33b}

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9b

{Rosh haShana 32b continues}
Mishna: The shofar of Rosh haShana, we do not remove from upon it a heap of stones, nor do we pass beyond the techum, nor do we climb a tree, nor do we ride upon an animal, nor do we swim upon the waters, nor do we cut it with anything prohibited because of shevut {Rabbinic prohibition} nor with anything covered by Biblical prohibition.
But, if he wishes to place within it water or wine, he may place.
And we do not hold back the children from blowing {the shofar}, and {on the contrary} we occupy ourselves with them such that they learn. But one who {merely} occupies himself with it {, blowing it to teach} does not fulfill, and one who hears from one who is merely occupying himself with it does not fulfill.

Gemara:
What is the reason {that these various prohibitions are not superceded by the commandment to blow shofar}?
Yom Tov is a positive commandment and a negative commandment, while shofar is {only} a positive commandment, and a positive commandment does not come and push off a negative and positive commandment.

"nor do we cut it with anything prohibited because of shevut {Rabbinic prohibition}":
a knife. {sakin}.

"nor with anything covered by Biblical prohibition":
A saw.

"But, if he wishes to place within it water or wine, he may place":
They learnt {in a brayta}: Abba Shaul says: Water or wine is permitted, in order to make its sound clear. Urine is forbidden because of the honor {due it}.

"and we occupy ourselves with them such that they learn":
Rabbi Eleazar said: And even on Shabbat.
And these words are by a minor who has reached {the age of} chinuch {instructing}, but a minor who has not reached the age of chinuch -- on Yom Tov, yes, and on Shabbat, no.
And some say the opposite {in terms of minors who have not, or who have, reached chinuch}.

{Rosh haShana 33b}
Mishna:
The order or blowing is three sets of three each.
The measure of a tekiah is equal to that of three teruot.
The measure of a teruah is equal to that of three moans "yabavot}.