I guess this should be a separate topic, but Jerry might forgive me.
maki wrote:Forgive a stupid question, does half holing always work for any whistle?
Not a stupid question at all, maki. "Work" is a relative term here.
Sure, if you partly cover a hole, you'll always get an intermediate note. If you're lucky and you work at it, it will also be a useful note. Otherwise, you might get a note
o That is tonally fuzzy or dark compared to the diatonic notes.
o With inexact intonation, because you're guessing how much of the whole to cover or uncover.
o Whose fingering is too awkward to be used in context without producing unwanted spurious notes or sliding portamento, or requiring extra tonguing.
Of course, sometimes you may actually want one of these effects. In which case, you're golden.
Otherwise, if you can find a cross-fingering that works on your whistle for a particular note, it mostly avoids all three problems. A practiced cross-fingering can be as agile as any standard fingering, with no spurious notes. The intonation may require breath correction for intonation, but it will always be consistent, not an analogue "guess" like half-holing.
Fortunately, the two most useful half-holes are C-nat and F-nat. C-nat as an occasional intonation-flexible alternate to cross-fingered C-nat. Which leaves F-nat as something to work on (and some whistles give a usable xxxoxx crossed F-nat in the second octave).