Is there any way to make the high a to super high d quieter than what it is when I play it. don’t know if it matters but i have a feadog clarke natural clare 2-piece and little black whisles all in the key of high d.
Cotton wool in the ears works. 
To a certain extent, it’s a trade off. There are whistles that are quieter than others on the high notes, but they also are often VERY sensitive on the low notes. So you can probably tweak your whistle to make it quieter on the top end, but you’re likely to have to then learn to treat it very gently on the bottom end.
Tweaking is not something I’ve ever done, so someone else will have to advise you there. I only know that I favor whistles with an easy top end, and so have had to learn to exercise breath control on the bottom.
Redwolf
A reasonably priced whistle that is not too sensitive on the bottom end, and yet has a relatively soft, sweet high end, is Mack Hoover’s Whitecap.
Best.
Byll
I have two suggestions to offer.
- The easiest part of tweaking a whistle, and one that seems to stabilize it the most dramatically in many cases is to pull the mouthpiece off (see the How to Tweak a Whistle article on the main C&F site if it doesn’t come right off) and fill the cavity under the windway with sticky tac (AKA Blue Tac). I’ve found that it takes all of about two minutes to do thusly:
Pull off a glob of sticky tack about the size of a pea. Roll it into an oblong ball or cylinder. Carefully drop it into the open end of the mouthpiece so it falls into the cavity under the windway. Tamp it into the windway with something that has a flat end. (I use the handle of an exacto knife. A new pencil or a chopstick might work.) You want the sticky tac to completely fill the cavity exactly to the front edge of the windway and be as smooth and square to the bottom and sides as possible. If necessary, add a little more sticky tac. Be careful how much you put in each time. It’s easier to put in than take out. If necessary, you can trim it off inside the mouthpiece with a sharp knife, but it’s tricky to do and you have to be careful not to knick the windcutter blade, etc. with the knife.
There are other tweaks that might help, but they can be a little tricker to do and risk messing up the whistle. This one by itself may be enough to make a difference. If you’re a little more adventurous and you still don’t have as much improvement as you’re hoping for, go ahead and follow the complete tweaking instructions in the C&F article.
- I’ve noticed that as I get more and more familiar with the whistle, I can sense the minimum amount of air needed to keep in the upper register and am able to control the volume somewhat that way. (The highest note I routinely play in the tunes I’m working on is the upper register C#, which I’ve been able to soften somewhat as I practice.)
Best wishes,
Jerry