Rogue whistle is not rogue, rogue whistle playing song you also line it has an elegant name called finger whistle
You can first look at the introduction of my first article~
Here tell you to blow quickly, the gesture that can best make you get a sense of achievement, as an entry to master the principle, but not the most convenient, the follow-up will slowly say other gestures, everyone likes to learn to pay attention to the convenience of follow-up search.
This is the most convenient and fastest gesture I practiced when I first practiced - the four-finger V-shape of my hands, and I can generally get a sense of accomplishment in minutes, as shown below:

Two hands four fingers V-shaped
Of course, the picture is only the posture of the hand, but also put into the mouth, the tongue naturally against the lower lip, the hand on the tongue, the two lips contain the fingers, surrounded by a triangular area, the air flow vibrates in the triangle area to make a sound, the side picture is as follows, the ugly painting is not sprayed, the expression of that meaning is good [cover the face], everyone combines my other articles to see the method, here you do not understand the may be said in other articles.
Interior side view
Practice found that this gesture can be sounded quickly, and then slowly said two-handed one-finger v-shape, one-handed two-finger o-type (ok-type), one-finger o-type, one-finger blowing, off-hand blowing and so on.