In very basic terms this slider (cross fader) controls the volume of the scratch. But it’s actually being used rhythmically, because a scratch is a continuous sound, and by cutting the sound out they produce distinct notes. What the cross fader does is blend between channel A and B ( called decks) where A might be a track playing all the time and B has the scratched part that is being added by moving the cross fader over to deck B.
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