i’ve read about these merliton (mirliton?) holes in ancient flutes (chinese Ti and others like a kazoo)
it is basically an extra hole covered with something like tracing paper, crinkly cellophane or onionskin. apparently it tends to buzz somewhat as you play.
i imagine you could work out some way to disable it, by covering with a finger or flipping over some lid or something.
i’m primarily a dijeridu player, so i really like the idea of getting more harmonics & richer sound happening. Has anyone out there tried this on a whistle? like it?
cheers,
charlie