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
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