I was wondering if people could chime in regarding the possibility of making something like this. I’ve had this idea in my head for a week or two, and seems like it would work. Perhaps there’s some reason it’s impossible, which could be why it’s never been tried.
My idea is a 6-hole whistle combined with a magnetized slide whistle. Specifically:
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The body would be made up of an ordinary 6-hole whistle with a slide whistle attached to it on the left. The whistles could either have entirely separate windways, so you’d play with both windway ends in your mouth, or they’d share a single windway that would split into two whistles. Either of these options would work for the whistle I’m proposing.
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You would play the 6-hole whistle normally (your left hand would just have to stretch over the slide whistle to reach the bottom three holes).
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A single key, normally depressed by the left thumb, would cover the fipple of the slide whistle, stopping it from making any sound (and also stopping any air from flowing through it). Lifting your thumb off the key would uncover the fipple and allow the slide whistle to sound.
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A slider would be located underneath the 6-hole whistle and operated by the right thumb. It would be attached to the slide whistle’s slide, allowing you to change notes on it by sliding your right thumb up and down.
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Magnets attached to the slide whistle would lock the slide to certain notes. The magnets would force the slide whistle to lock into the notes of the D major scale. Additionally, perhaps some of the magnets could be moved slightly to change the notes that the slide whistle would lock into (e.g., you could change the position of a magnet and make it lock into C natural instead of C sharp).
Maybe I’m totally off-base, but it seems like this might work. It would allow you to play fast/intricate stuff on the 6-hole whistle exactly as you normally would, while using the slide whistle for occasional harmonization. You wouldn’t be able to play very fast stuff on the slide whistle, but you wouldn’t need to; it would function more like a drone that could change notes (or like a regulator on the pipes). You could use it to hold notes that are part of the chord being played, while the 6-hole whistle is playing melody. You could also imitate double-stops on a violin, harmonizing certain notes to add to the character of a tune. If you were playing more slowly, you could play fully harmonized tunes like those written for English double flageolet.
Of course, there are plenty of double-flageolets and double-whistles out there. But it seems to me that all of them suffer from one or more flaws: they force you to relearn the fingering you’re used to using on normal whistles in order to play simple melodies; they require awkward mouth techniques to stop one whistle from playing while the other is playing; they typically do not provide for a simple way of switching back and forth between harmonized melody and a single melody line (you typically have to reposition one of your hands); their harmonization capability is relatively inflexible, because one or both of the whistles are typically lacking several notes; the more flexible ones have a lot of complicated keywork; and finally, they have trouble allowing one whistle to switch octaves while the other one holds a drone note.
It seems like attaching a slide whistle to your 6-hole whistle would solve most of these problems and offer additional advantages. You wouldn’t have to relearn how to play it; anyone who plays 6-hole whistle could play melodies on it with ease. The slide whistle has only one hole (the hole the sound is coming out of), which can be covered by a key to completely stop the sound without wasting any air. This would allow you to switch between harmonized melody to a single melody line without interrupting your playing or repositioning your mouth/fingers. No keywork would be required, other than the one simple key covering the slide whistle’s fipple. Since the slide whistle has a closed end and no tone holes, you can fit a very large range into one (I’m pretty sure a slide whistle only half the length of a standard high D whistle could manage a full octave from D to C#). This would potentially allow you to access quite a few notes just by moving the slider a relatively short distance with your right thumb. And finally, I’m pretty sure slide whistles don’t switch octaves very easily (due to their closed end), which could potentially allow you to hold a drone note on the slide whistle while the 6-hole whistle is breaking the octave.
[EDIT: I’m no math person, so I asked ChatGPT to do the math on this, and it concluded that a slide whistle would only need to move its slide 5.35 inches to get a 7-note range from D5 to C#6. If anyone wants to verify the math on this, feel free. 5.35 inches does seem like a long distance for your right thumb to travel while your right-hand fingers are playing. But I imagine you’d rarely ever need to use the full range of the slide whistle to harmonize effectively; D5 to A5 only needs 3.78 inches of travel, which seems doable. And perhaps a lever mechanism could be added to the design to increase the range you could practically access with your thumb.]
Some additional optional features:
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Maybe there could be some kind of spring-loaded mechanism that allowed you to make the windway on the 6-hole whistle a tiny bit smaller by pressing your lips together. This (I think) could allow you to play into the second octave on the 6-hole whistle while not expending much more air, allowing the slide whistle to stay in the first octave.
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If holding the whistle is a concern, you could always add a ring for the left hand that would allow you to support the instrument using the base of your left thumb, but still allowing you to left that thumb off the key to activate the slide whistle whenever you saw fit. This would also allow you to slide your right thumb more freely without dropping the instrument.
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Since both your pinkies would be free, you could also potentially add extra keys to the 6-hole whistle to make it fully chromatic.