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...In figure four above, note the areas of tap tone uniformity: These areas should be the same tap tone as the top plate in front of the bridge, both uniformly all across the front face above the cut out holes, as well as downward on the top surface. When the front surface tap is uniform, the top edge downward tap tone should match. The horizontal bar of wood just above the bridge feet should be tuned to the back plate tap tone. Scraping down (thinning) the front surface (toward the fingerboard) will lower the tap tone.
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achieved.
.. What if the tap tone of the top of the bridge is lower than the top plate already?
The bottom arching of the bridge can be raised to raise the tap tone of the string directly above. Normally, for individual strings that are too low, the top surface of the kidney shape below the string can be carefully sanded, filed, or carved to increase the tap tone until it matches the top plate and the rest of the bridge. A third possibility is to sand the side of the bridge which will raise the tap tone of the strings on that side; just sand with an emery board evenly from the kidney shape up until the tap tone is high enough to match the top plate. See Figure Five.
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Remove material from this side to raise both the strings on this side.
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Remove material from this side to raise both the strings on this side.
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Remove material here to raise 'E' string tap tone.
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Remove material here to raise tap tone of 'D' string.
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