Whistling (Part 5) - The Entire Pitch Range
Let's now review...
1) Whistling a high note you'll notice your tongue forward in your mouth, with the pitch being created near the front of the tongue. Note that the rest of the tongue is high and large in the mouth, filling up the mouth cavity so that the air volume (space, not loudness) is small... this is what's needed to sound that high pitch.
2) Whistling a medium-pitched note (like 4 draw) you'll notice your tongue in the middle of your mouth, with the pitch being created near the middle-front of the tongue. Note that the tip and back of the tongue is not humped up.
3) Whistling a low-pitched note (like 3 draw and below) you'll notice your tongue in the back of your mouth, with the pitch being created near the back of the tongue... it can also help to drop the jaw. Note that the tip and middle of the tongue is not humped up... it's down so that you can have a resonant chamber... always think "big tone" by getting parts of the tongue down that don't need to be humped for the whistling/bending process.
You've new spent time with the three main areas of bending.
Now whistle making position 1 "sh", position 2 the sound "kee" and position 3 the sound "koo"... slide from "sh" through "kee" and finishing on "koo." Experiment with this...