PS: I don't know why the formatting is so strange in my post. Tried everything but it always produced an endless string of words in just one line (?).
PS: I don't really know the correct key of the song. It changes somewhere in the middle. It is played on a low F, that's all I know. Since I play everything by ear I often couldn't even say which key a tune is in.
Exactly. It is a low F but the tune goes all the way up to the end of the 2nd octave.
I should maybe explain that my left ear is slightly damaged since I was in my twenties, so for 20 years now.
And I do get tinnitus sometimes. The "problem" with the low whistles in my opinion is that there is much more air vibrating inside the whistle,
so they produce much more sound pressure than a standard thinwhistle.
So when playing the 2nd octave on a low D for example it is more penetrating than the 1st octave on a standard D.
And the kitchen amplified it. So the tinnitus started again. It is still ringing in my ears while writing this.
So there's two factors at play that make a whistle "problematic" for me -- frequency and sound pressure.
I never would have thought something like this could happen when playing a low whistle.
So I guess the Kerry Optima F is just not for me (it is a great whistle but probably best played on stage or in a large open room)
and therefore I will also probably never buy a Goldie like I was planning.
They use the same mouthpiece design (based on Bernard Overton's design).
And they are simply too loud for me, at least in a small room. No problem in the living room or outside.
So I made a low F today myself with a very narrow bore which is very quiet. And somebody recommended the Carbony whistles as they are also quiet.
Guess I'll be trying a low F Shearwater next as they also seem to be a little more mellow.
@sedi , I just listened to the Youtube version of "May Morning Dew" by Moving Hearts. Very haunting and evocative. Am I correct in thinking that in the video they are playing this in a C minor key?
When you say the Optima F, do you mean a LOW F whistle? ( not a high F two steps above standard whistle D) If you do mean the Low F whistle... are you saying you still find it too piercing in the second octave, even on such a low whistle? 
Currently I'm working on "May Morning Dew". Made the mistake of practicing in the kitchen and almost blew my eardurms out while playing those long high notes (the sound is amplified in the kitchen compared to my living room, just because it's smaller). I only noticed it afterwards because my tinitus got worse. Now I probably got to pause a couple of days or only play very quiet whistles. The Kerry Optima F is almost too loud for me in the 2nd octave. I think I need something softer. So I'm thinking about getting a Shearwater alto F just for this song :). Well, one can never have enough whistles.
