Skip the laptops and loads of proprietary hardware with an ultra-simple, portable, affordable add-on that turns any turntable into a digital vinyl turntable. That’s the pitch from NAP Works for compact hardware built on open-source tech, now on preorder. It might do more than just impress digital vinyl DJs: this has the potential to win over even the CDJ crowd. Think of a cute little box that you can add to any turntable. Plug in a USB, put on two digital vinyl records, and go. Open-source tech had already made this possible, but generally, folks still had to contend with a laptop and an audio interface. And the solutions were far from plug-and-play. This is different: the vision is really a compact box that’s stable enough to make any pair of turntables into a digital DJ setup. And with solid software and a display, that means this isn’t just coming for the digital turntablist niche.…