I wish I had you in my pocket the other day, those whistles are lovely! I would have loved to be able to share them and explain so much prettier, how you did, that they can't possibly be identical and be in tune.
As for buzzing...
My Waltons has does have a bit of a buzz to it, particularly the bell note. It's my only complaint apart from the coating on it. The Dixon and Sweetone sound rather twee beside it. It was worse when I first got it, no matter how hard or soft I blew, I didn't want to blame the whistle so put it down to user error and figured I'd work on it.. Then someone suggested putting some clay in the back of the mouthpiece and most of it went away, though if I don't blow hard enough in the second octave, it's there, trying to drop to the lower octave. I have a hard time blowing hard enough to remove it on some of the higher notes, I don't hear it on the other whistles. It's the first thing I notice when it gets clogged as well. I even removed the clay after 6 weeks of playing to see if it wasn't all in my head but the ringing/buzzing worsened. (it's back now, sadly doesn't sound as good as it did the first go but that probably IS in my head) But, I just listened again to that recording, and they all sound awful and I can barely tell the difference between them on it, so I'm not going to use vocaroo any longer.
The Waltons though does have a different sound than I've heard other whistles have on recordings, and I didn't expect it to sound like this when I got it, but then I watched a LOT of comparison videos on youtube, Nataniel Dowell has the best comparisons in my opinion. His has a similar tone to mine, though I do not play it so well, you can definitely tell the difference between it and the other whistles when played by someone who does play well. I trust his videos because he doesn't tweak the sound, as some other youtubers have.
I don't argue that I have a great ear, but I did recognise someone's golf club by the sound it made hitting the ball this past summer, so it can't be awful can it? I had the same club, asked him if he was playing it, and ended up running home to sell him mine. Plus, it is my ear, and I ultimately have to be the one to like the sound of what I'm playing at least when I'm alone. And they always sound different when resonating within your own skull, right?
Mind you, I'm someone who isn't a fan of some really popular whistles (Susato and Carbony come to mind sorry if I hurt anyone's feelings), so it could be just me. Though I may like them in person, I think we know what we like and what we don't. I'm just at the point of wanting to know how to describe the sounds I prefer, and stay away from the ones I don't. That's another reason I love Nathaniel Dowell's channel, he shares a ton of different whistles, compares the same tune between whistles, describes the tone, what he likes and doesn't like and doesn't alter the sound with special effects. He however doesn't like his Waltons, but even listening on this one it sounds good to me, so I'm keeping with it.
https://www.youtube.com/watch?v=9A7bDfDBTLc
I tried putting a piece of tape on the end of the sweetone and playing softly, and put it on a video instead of using vocaroo. Vocaroo removes the background noise, my camera doesn't so I apologise in advance for that, but here's me playing a tune, slowly and clearly so you could hear the notes.
https://streamable.com/ox88yr This is with about a mm of tape on the end, I suspect adding another mm will be best, though I am trying to play softer, as mentioned, the notes get wheezy and I can't hit the second octave so for now, this is the best I have. Tune is Cronin's Favourite, not too popular but a fun tune, excellent rendition here, I'm planning to learn this entire set to play along with it, at the moment, I have to constantly rewind, tune starts at 2:25
https://www.youtube.com/watch?v=s68W4enSGOs I can play this around 60bpm, so have to slow it down a little until I can pick up speed, above that and I lose the tune. It probably sounds fine, even listening to that it sounds less sharp than it does inside my skull. Most telling is when you compare instrument to instrument, so I don't think I'll play this one with anyone if I can't tune it.
I ran flutini in the background while playing, to catch, it's still a little sharp but not as much, so I may look at just adding a little to the end of it if I can't lengthen it from the other end. I was given this neat site so know that fine tuning is definitely doable on a whistle if one is so inclined. I'll wait for Mr. Freeman to come back to work after he's done saving lives if I feel the need.
http://www.mcgee-flutes.com/Tin-whistle-retuning.htm In the meantime I'm looking forward to a hand tuned whistle from Mr. Becker.