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Fade (audio engineering)
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<p>In <a href="/facts/Audio_engineering/eRJkg89Q">audio engineering</a>, a fade is a gradual increase or decrease in the level of an <a href="/facts/Audio_signal/rFSTI9IF">audio signal</a>. The term can also be used for film cinematography or theatre lighting in much the same way (see <a href="/facts/Fade_(filmmaking)/AovejGyp">fade (filmmaking)</a> and <a href="/facts/Fade_(lighting)/ts1xk6rS">fade (lighting)</a>). </p><p>In <a href="/facts/Sound_recording_and_reproduction/BMbpAWkE">sound recording and reproduction</a> a <a href="/facts/Song/wm7uRPzQ">song</a> may be gradually reduced to silence at its end (fade-out), or may gradually increase from silence at the beginning (fade-in). Fading-out can serve as a recording solution for pieces of music that contain no obvious ending. Quick fade-ins and -outs can also be used to change the characteristics of a sound, such as to soften the <a href="/facts/Envelope_(music)/FJylhHed">attack</a> in vocal <a href="/facts/Plosive/okC9pztc">plosives</a> and percussion sounds. </p><p><a href="/facts/Turntablism/4fboh9Hz">Professional turntablists</a> and <a href="/facts/DJ/5YYYRqPB">DJs</a> in <a href="/facts/Hip_hop_music/0lsHpwAD">hip hop music</a> use faders on a <a href="/facts/DJ_mixer/LLVHY3Ys">DJ mixer</a>, notably the horizontal crossfader, in a rapid fashion while simultaneously manipulating two or more <a href="/facts/Phonograph/VcNQRYVT">record players</a> (or other sound sources) to create <i><a href="/facts/Scratching/JPmunbJ1">scratching</a></i> and develop beats. Club DJs in <a href="/facts/House_music/2UFwER68">house music</a> and <a href="/facts/Techno/BBqWRxmt">techno</a> use DJ mixers, two or more sound sources (two record players, two iPods, etc.) along with a skill called <a href="/facts/Beatmatching/vEmkTuAb">beatmatching</a> (aligning the beats and tempos of two records) to make seamless dance mixes for dancers at <a href="/facts/Rave/1cBwPCEJ">raves</a>, <a href="/facts/Nightclub/krTvUzaj">nightclubs</a> and dance parties. </p>