How can you modify your whistle technique for better sound?

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Choosing the Right Whistle A good whistle should produce a clear, loud, and piercing sound that can be heard from a distance. When selecting a whistle, look for one made of durable materials such as plastic or metal, and choose a whistle with a frequency of around 3,500 Hz, which is the most easily audible frequency for humans. Avoid whistles with narrow mouthpieces, as they can be difficult to blow into and may produce a weak sound.
Developing Your Embouchure The embouchure, or position and shape of your lips, tongue, and jaw, plays a crucial role in producing a clear whistle sound. To develop a good embouchure, place the tip of your tongue close to the roof of your mouth, just behind your top front teeth. Then, blow air through your pursed lips with enough force to cause your tongue to vibrate against the roof of your mouth. Experiment with different embouchure positions to find the one that produces the clearest sound. A good rule of thumb is to aim for a whistle sound that is loud enough to be heard from 200-300 yards away.
Mastering Your Whistling Technique Practice is key to mastering your whistling technique. Start by practicing simple whistle patterns, such as a single long note or a series of short notes. As you become more comfortable with the sound, try experimenting with different whistle patterns, such as a three-note Morse code pattern (three short notes, followed by a long note, and then three short notes again). To signal for help in an emergency, try using the SOS pattern (three short notes, followed by three long notes, and then three short notes again). Remember to blow air through your pursed lips with enough force to produce a clear sound, and to experiment with different embouchure positions to find the one that works best for you.