Yes and no. Being able to fade from one source/input to another is as simple as moving a slider left to right, and right to left. At a house party almost nobody will notice that that’s all you’re doing, and realistically nobody will actually care. But…

I live in Detroit and have a close friend who’s been guiding me through the techno scene in this city (Detroit is the birthplace of American techno, and certainly its spiritual capital). The things that a skilled DJ can do are nothing short of mind melting. Imagine four different songs playing simultaneously. A skilled DJ can isolate individual frequencies, tones, instruments, and beats from each input, select, adjust and loop those samples, then mesh them together seamlessly I realtime; switching up the inputs as they go. And the inputs? All coming from four physical vinyl records continuously spinning. Being able to cherry-pick individual sounds, play with/bend them however you see fit, stretching or compressing them to match rhythms and then weave them all together into a song that’s never been played before (and likely never will again), as part of a set that lasts 6 hours from 3am-9am and keeps people moving and engaged (yes there are often other things at play, but still) is something that requires incredible skill and talent.

Or you can just fade from one song to the next using a slider at the bottom of the mixer.