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<p>amplifies the electrical signal of an <a href="page.php?w=electric_guitar">electric guitar</a> so that it can drive a <a href="page.php?w=loudspeaker">loudspeaker</a> at sufficient volume for the performer and audience to hear. Most guitar amplifiers can also modify the instrument's sound with controls that emphasize or de-emphasize certain frequencies and add <a href="page.php?w=effects_unit">electronic effects</a>. String vibrations are sensed by a <a href="page.php?w=Pick_up_%28music_technology%29">pickup</a>. For electric guitars, strings</p><p>
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