The aim of our research was to improve the tone of a guitar by trimming wooden braces on its top plate. As a criterion for tone quality we used the 'rule of consonance-dissonance' that correlates the aesthetic quality of a tone with its spectrum. Experimentation with a test guitar and four sanded top plates suggested the following method for tone improvement: when the tone is sub-optimal, trimming of one of the two largest braces for a certain small amount results in improved tone quality. In contrast, this rule does not apply to the test guitar with four planed top plates, indicating the importance of the machining process on acoustic properties of an instrument.
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