I was just wandering what the difference is between the two sounds. I figured one is sharper than the other 
But just how different are they?
Also I’ve been looking at the Susato Low F’s and I was wondering what is the difference between the M series and L series Low F.
I know the L series has a larger bore diameter, which makes it louder right?
Sorry, Leachim, your question isn’t really clear. What do you mean by “low”?. The difference between the equal tempered notes F and F# is one half step or semitone, a minor 2nd interval, 100 cents, two adjacent keys on a piano, a multiplicative frequency ratio of the twelfth root of 2 (~1.059463094359). F = 698.5 Hz and F# = 740.0 Hz in the first octave of a high D whistle. F# is higher in pitch than F by definition. Is that what you mean?
If you mean low F vs F# whistles … the two are pitched a semitone apart. See above.
An F# whistle might be useful for playing B tunes with G fingering along with a piper playing a flat set in B. Or for transposing scored parts in non-trad keys. Otherwise F is far more used in ITM.
If you can explain what lead to your question, it might help! 
Maybe, maybe not. Darker tone, and the larger windway takes more air.
TMI!!!
one fret
done
I could not say it better and that’s no lie. Cheers.
MTGuru,
I meant Low F and F# whistles 
…What my question really meant was: is that semitone differential maintained through out the entire scale on those whistles?, or is it only on the F or F# note?
XXX XXX is F or F#
XXX OOO is Bb or B
or…yeah, for any fingering on a F and a F# whistle the F will be a 1/2 step lower than the F#
Ah OK, I think I understand …
Yes, the entire scales are a semitone apart. Every note on the F# whistle is a half-step higher than the same-fingered note on the F whistle. It’s not just that the F# whistle plays an F# instead of an F natural.
Whistles are identified by the lowest note – the “bell” note you get when all 6 fingers are down. That note is also the tonic starting note of the natural (major) scale of the whistle. So in this case, the scales you get are
F whistle: F G A Bb c d e f
F# whistle: F# G# A# B c# d# e# f#
(Yes, that’s really an e# … it’s enharmonically the same as f-natural, but has to be written that way so that there’s one of every letter-name note in the scale!)
You’re right … It’s possible to make, say, a D whistle that plays an F-natural instead of F#. The scale you’d get would be an “ascending D melodic minor scale”, or a D Dorian scale if you play c-natural. The latter would actually be useful in ITM, but it’s just not the way whistles and other ITM winds developed.
Hope that helps!
P.S. Sorry for mis-spelling Michael backwards.
Okay thanks, thats exactly what I wanted to know.
Sorry for the confusion
Thought I’d chime in here with what I know about this as I recently had Mack Hoover build me a low F# in CPVC. As expected from him, it is one fine whistle and very reasonably priced. I got it mostly so I’d have something else to play in the key of B.
There aren’t too many F# whistles available. Other makes available from what I’ve seen are Burke, Susato, Humphrey, and Overton. These makers along with Mack are the only ones I know that have a full range of whistle keys and provide a variety of building material, prices, and sounds.