Just a suggestion, try a few singing lessons.

I`m not a whistle player though I do dabble. However it is interesting following this discussion on "thinking" a sweetness of tone into the upper register of whistle. Singers often have a "harshness" of tone in their upper register and it is a wonderful experience hearing upper notes in the human voice register sung with a delicate sweetness and a lightness of touch. Almost always this skill comes from a well trained voice. The untrained voice usually sounds strangled and strained in the high registers which comes from a tension in the throat and lack of breath control. "Belting" the high notes is usually the only way untrained singers can overcome this but it results in a vocal quality that may well be at odds with what is artistically wanted.

Trained singers, as I understand it, develope their breathing to control the volume and "place" the voice in the "head" for such notes. (It feels like the sound is comming from behind the eyes and bridge of the nose). In other words using the body`s natural resonance in the head to give the sound its "sweetness" rather than the chest, (for lower notes), or the throat (which gives that "strangled" sound). I`m sorry if I havnt explained this very well but I hope you get my drift!

My thought is that perhaps an adaptation of the "head sound" is what is happening to those skilled whistle players who can "think" a sweetness into the upper tones of a whistle, (is it me or do I think I see simmilar body language with trained singers going for high notes? Head forward, eyebrows raised, chin dropped rather than thrust forward?) so maybe a few singing lessons would help others find that sound? The breathing excersises for singers would do no harm in any case! :-)

wadya think folks?