As an ex-physicist, my starting point for designing a G chanter would be to reduce every linear dimension (bore, hole spacing, reed length, reed thickness) of an F chanter by 10%, or for a D chanter, to increase by 20%. I would aim to raise the crow pitch by just under a tone or just over a minor third. Other solutions would be possible, but they would sound different. My G chanter works fine, but it has a very different tone from the F chanter, as do most G chanters I have heard. John
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