[nvillar] wanted a relatively cheap way to make a rotary input device for audio mixing. After looking at several options including turn tables and professional audio scrubbers, they decided on the hard drive due to its size, price, and the feel of the disk. The geek factor of using a hard drive as an input device probably didn’t hurt either. They provide schematics and details on how to make it all work. There’s a video after the break of the unit sending signals to a computer. No performances though, sorry.