Setting the tones is relatively easy, there are online calculators for setting them up so they will be close to what you want. After they are cut you can tune them as well by either removing wood from the underside. remove from the base of the tongue to lower the pitch or from the tip to increase the pitch. I will try it with some 1/2" plywood i have in the house to play around then use some paddock or bamboo plywood (a cutting board i have around) to make the final version.
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