Ok, let me try...
First try to make a trill sound that do roll but do not sound like rrrrr.
roll you tongue up until it reach the ceiling of the mouth, at the front area of it:
If this is your mouth from the side and G is the tongue, and T is the teeth.
Code:
ooooooooo
oooo G o
G T
G T
GGGGGGG
T
oooo ooT
oooooooo
In order for this to work, your tongue must touch the ceiling extremely loosely, almost not touching it all.
Now tighten your diaphragm and apply air pressure on the tip of the tongue area, and touch the ceiling with your tongue simultaneously.
The air pressure push the tip of tongue down so that it stops touching the ceiling, but your muscle pressure on the tongue immediately snaps it back up and so on, causing the vibration.
It's like a war between the air pressure, coming from the diaphragm, that push the tongue away from the ceiling ( the air is coming between the tongue and the ceiling, pushing it down ), and muscle pressure of the tongue that want it to stay attached to the ceiling.
The key is to balance these two forces. If they are equally strong, you will reach point of balance that alternates between the two, and this is the vibration.
I'll give you an example to make you understand what I mean by this power balance.
Try to slide your finger on something smooth like a table. use the tip of the finger, not the nail side, but the soft tip of the finger is touching the table. apply strong pressure on it, and slide it on the table in a way that makes the tip of finger vibrate. If you do it right, then it will make a low noise too, depending on the material of the table. If you use too much force to push the finger down, then it will stay in it's place and not move. If you don't apply enough pressure then it will slide smoothly on the table without any vibration. Only when the two forces ( The push down force, and the slide sideways force ) are in equals power, you reach a point of balance where the effect on the finger is alternating between the two forces, causing a vibration.
Well exactly the same thing is happening with tongue, with the air replacing the sideways force, and the tongue muscle replacing the arm muscles.
But this just makes the trill sound. If you succeed in doing that, you can make it sound like rrrrrrrr.
For this you have to do something additional, and that is to make a ahh sound. You know the sound that you make with you vocal cords when you say ahhhh, or when you hum. If you make this sound together with the trill you will get the rrrrrrr.
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