[K.C. Lee] figures a device this simple would make for a great Hackaday Prize entry, so he built a USB HID multimedia dial. It’s a rotary encoder and a button. This one lights up, though ...

He’s converted a mouse into a tuning dial. The scroll wheel on a mouse is nothing more than a rotary encoder, and can easily be used as a sort of tuning knob. Replacing it with a better encoder ...