Just seen the Walton Mellow D whistle on a website.
Can anyone tell me what is the difference (if any!) between this and Generation or Feadog D whistles?
They all have different style of mouthpiece, all plastic, but all different.
I’m no expert but I prefer the feadog and the generation to mellow d. Also the mellow D is reputed to have a sharp bell note. (which I think means the lowest note is out of tune)
I also think that the mellow D is a wider bore whistle and takes more breath to play than the feadog and generation. Though I am not sure.
The Mellow D is my favorite desktop whistle. It has a nice pure tone and seems in tune with itself (checked with a tuner it’s a bit off, though) with a little less air/chiff than the Generations and Feadog’s I have. They are cheap–try one.
PS: I believe both Kerry Whistles and Tony Hinnigan may still have video reviews on their sites if you want to know what someone with far more ability than I have thinks.
They do have a larger bore diameter than Feadog and Generation. They also have a taller windway and take a bit more air to play. The bell note, as mentioned, is consistently sharp in these whistles. They are a little more forgiving in terms of playability compared to Feadog and Generation whistles.
Walton’s Mellow D is a pretty fine whistle, although not as terrific as the no longer produced Walton’s Golden Tone C. I like Walton.
Philo
Thanks for all the advice.
Maybe get 1 and give it a try, might as well…
I watched the Hinnigan video. Tony was very impressed and stated that he “wants one”. I have one coming next week and will post my impressions. Best, Cyril.
I like the Walton and the nickel Feadog but you will need at least one of each of these three. 
Also the mellow D is reputed to have a sharp bell note. (which I think means the lowest note is out of tune)
I also think that the mellow D is a wider bore whistle and takes more breath to play than the feadog and generation
It has a nice pure tone and seems in tune with itself (checked with a tuner it’s a bit off, though) with a little less air/chiff than the Generations and Feadog’s I have.
Cool
There are several ways to correct the sharp bell note on a Waltons whistle. The tone tube is a little short. Obviously an extension will work if you find a tube the right size and tube cutter. I have read that some use tape to extend the end of the tube. Instead of extending the tube the air column in the tube can be restricted with something like poster tac or an O ring. Poster tac requires some experimenting to get it just the right size and location, and then if it becomes wet may fall out. I could not find an O ring that was metric that would fit just right.
Take the whistle to your favorite hardware store, and look for the rack that has coils of clear neoprene flexible tubing. It is sold by the foot but they might let you buy less than that. Find some that has an outside diameter of 1/2’’ and inside diameter of 5/16’‘. It should just fit in the Mellow D or C tube with a little friction. The tricky part is cutting a piece a little less than a 1/16’ long. By putting a wood dowel or pencil in the tubing and then with a sharp tool cut through the tubing to the wood. Insert this short ring into the end of the tone tube and push it to just below the first hole from the bottom. It will restrict the air and bring the bell note down without affecting the other notes. If it is to thick it wll bring it down to much.
I would have to agree-----the mellow D is not that great, its MP works better on the C bore -----------if i had to choose----it would be a GEN---------------i just got a Feodog Pro D we will see how that is
too much trouble -------- no disrespect bro 
Walton used to be good Vinnie kilduff used those
The Mello D has the same head as the current Walton’s C whistle.
I like the Mello D well enough - decent volume, nice tone - but over time I’ve come to prefer Feadog and Oak D whistles. Just a matter of taste - they’re nice whistles, and a wrap of electical tape is a good way to experiment if you think you need to extend the tube.
All that being said, I think that the head works much better with the Walton’s C tubes. The bore diameter seems a bit big for a D but perfect for a C. And I think that the Walton’s C whistles are some of the best out there, regardless of price (I like mine nearly as much as my Humphrey and Syn C’s - and they cost a LOT less).
Some of the difference between a Waltons and Feadog fipple is that the Feadog has a slightly tapered windway, and the Waltons is straight.