I bought Freeman Generation brass set (Bb, C, D, Eb, high F, high G) a month ago (I'm not sure whether I told it here already).
I'm very curious who plays on that high G, because it is so small, almost unplayable (holes are too close together). I lending it to my son (3yrs).
From the other end, on Bb I play with something like "quarter piper's grip" - Upper hand is as usual, bottom hand hold it similar as on low whistle (but there's still big difference).
C whistle I used only once, when my son tried to sing a child song. I didn't noticed any breathing speciality on this whistle, except lack of habit on holes spacing.
D whistle is still a major whistle for me (hey, I have four D whistles now 🙂 - Clarke Sweetone, Walton's, Mellow Dog and Generation).
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