It used to be that DJs would do their work on a physical mixer, with actual dials, knobs and buttons. Now you can have all that jazz right on your tablet, and the convenience has caused tons of DJs to flock to the new medium. But for those of you still longing for a bit of physical feedback, the Tuna Knobs can be placed directly on your touchscreen and will give your music-making somewhat more of a natural feel. They work just like a stylus, and can be removed when you’re done playing your set. They’re relatively cheap, at €22 (about $25) for a pair, or $67 for 6 and a travel case.