I tried a Walton’s LBW for sh*ts and giggles because it was less than US$6. It’s a little quirky, but it’s a hoot. 
What is with all those songs about underpants??? Braes this, braes that . . . ??? 
A couple years ago, I had just moved into a new apartment. Unfortunately all of my whistles were too loud for my neighbors. Mack Hoover had made me a few quieter whistles that I loved but they were still too loud. I asked Mack if he would make me an ultra quiet high D. He did.
The problem was that ultra quiet and easy playability just don’t go together. Every time I played the whistle, it would squeak and squawk. I mentioned this to Mack and being the man he is, he didn’t hesitate to offer to modify the whistle or replace it or to give me my money back. I chose none of the above because I was pretty sure the problem was the player (me) and not the whistle.
I was right. I practiced and practiced on that whistle developing my breath control over time. Today, that whistle is one of my favorites and squawking is a thing of the past.
The moral of the story is “just keep practicing”.
Must be the countryside
D