How To Throat-Sing
STEP 2: The location of the tip of the tongue
Place the tip of your tongue against the roof of your mouth, as if
pronouncing the letter "L". Slide the point of contact slightly away from
the roots of your top teeth. Press the tip of your tongue quite firmly
against the roof of your mouth.
In Japanese, we don't use the "L"-sound at all. (The closest sound
we have is like ["L" + "R"]/2. That's why we can't tell "L" and "R"
apart.) If you have "L" in your native language, at least this part of the
instructions is well understood!.
Special thanks to Dan.
He translated all of these instructions!
Saga J Haruhiko