Your phone's mic is fine for quick audio memos and the like, but if you want to record music on it, you need something a little more robust. Roland revealed a palm-sized audio mixer at CES in 2017 ...

Compatible with iOS and Android smartphones, GO:MIXER connects digitally via an included cable, providing clear stereo sound that’s a marked upgrade over using the phone’s built-in mono mic or analog ...

But that didn’t stop [Christian Nödig], thanks to a defective mixer, he poked into the signals and built his own Ultranet receiver. Ultranet runs over Cat-5 ethernet cables but isn’t an ...