Regarding Thumbhole Options
The top thumbhole can be used to play a flattened seventh, (for example, on a D whistle it would play a C-natural,) and the bottom thumbhole can be used to play a flattened third, (for example, on a D whistle it would play F-natural).
![](https://cdn.shopify.com/s/files/1/2140/2331/files/Whistle_Low_Thumbs_Both.jpg?v=1712265664)
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