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In page Tap dance:
"Taps are mounted to the sole of the shoe with screws, and sometimes adhesive as well. The screws are driven into a soundboard – a thin fiberboard integrated into the sole that can be firmly "gripped" by the screws – to reliably attach the tap to the shoe. When no adhesive is used, the screws can be loosened or tightened to produce different sounds, whereas tonal quality is fixed when adhesive is used.[citation needed]