When a DJ is scratching a record with one hand, what is the slider in the other hand actually doing?

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When a DJ is scratching a record with one hand, what is the slider in the other hand actually doing?

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The sliders control how it fades in and out, echo, reverb, volume, distortion, gain, treble, bass, pitch etc.

The spinning of the disc is what gives it the scratch sound.

I think you’re talking about the crossfader. It allows a dj to switch from one record to the other. So if the track is playing on the right side, he can slide the crossfader to the right and only the right side recod will play, then when he wants to add a scratch, he can quickly slide the crossfader to the middle to scratch over the track, or all the way to the right to isolate only the scratch.

It basically has 3 positions. Only rightside plays, only left side plays, and in the middle both tracks will play simultaneously

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.