What are DJs doing when they adjust little knobs and sliders

[Question] What are DJs doing when they adjust little knobs and sliders during a set?
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Translated titles:
¿Qué hacen los DJs cuando ajustan pequeños mandos y controles deslizantes?

Was machen DJs, wenn sie kleine Regler und Schieberegler einstellen?

Que font les DJ lorsqu'ils ajustent les petits boutons et curseurs

O que os DJs estão fazendo quando ajustam pequenos botões e controles deslizantes

Što rade DJ-i kada podešavaju male gumbe i klizače

Co dělají DJs, když nastavují knoflíky a posuvníky

Wat doen DJ's als ze kleine knoppen en schuifregelaars aanpassen

Cosa stanno facendo i DJ quando regolano piccole manopole e cursori

Ce fac DJ-urile atunci când reglează butoanele mici și glisoarele

Что делают диджеи, когда настраивают маленькие ручки и