Want to mix and scratch like a professional DJ? To be a good DJ you need to understand the concepts of mixing tracks, adding cool effects, and of course you need a good sense of rhythm to line up the beats. This how to video explains how to use the echo or loop effect on the Denon DN-S1200 mixer. This is a small demonstrational on the echo/loop fx button. Watch this DJ tutorial so you can learn how to use the echo or loop effect on the Denon DN-S1200 mixer.