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<p>Some effects, particularly older ones such as <a href="page.php?w=Leslie_speaker">Leslie speaker</a>s and <a href="page.php?w=spring_reverb">spring reverb</a>s, use mechanical components or <a href="page.php?w=vacuum_tube">vacuum tube</a>s. Effects are often used as stompboxes, typically placed on the floor and controlled with footswitches. They may also be built into <a href="page.php?w=guitar_amplifier">guitar amplifier</a>s, instruments (such as the <a href="page.php?w=Hammond_B-3">Hammond B-3</a> organ), tabletop units designed for DJs and</p><p>
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