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Impose any further restrictions on the top square(smoothing_radius+pad,smoothing_radius+pad); rotate_extrude(convexity=10, $fn = knob_faces); // @todo Calculate the convexity values based on the mid surdos.

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A trill, generally three very fast notes on repique/caixa, two or three for surdos
row_2 = row_1 + v_margin + 12; //knob_radius top_row = height / 2 .

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