A demo recording of my new Shaw Low D whistle. Some people say that the Shaw needs a lot of breath but I think its more the speed of air that it needs so I breath through it like I do with my trumpet - concentrating on the speed of air rather than the quantity. If you have one and are having problems blowing it try keeping your cheeks in and raising the level of your tongue (think pronouncing "sss").
One of the big advantages of the Shaw Low D is the narrow diameter of the tube where the holes are and the close spacing of the holes themselves. A lot easier to play than my home made low D which has conventional hole spacing.