I’ve been playing on my brand new Copeland brass high D whistle for 3 weeks now and I must say: what a sound and a beast to play!
Used to play on Susatos … it’s completely different. A lot more easy to play but as challenging.
Now, I tempt to feel like the low octave is flat. I keep trying to push it a lot then I’m used to (and to not push the upper octave too much) but it’s really hard for me to play both octaves in tune.
The two different tones for the octave note with top finger on or off can sometimes (usually) be a problem with the “Bansri” type Indian whistles, especially the lower ones. The note with one finger off is annoyingly sharp and as I play it that way it’s very frustrating.