[nvillar] desired a fairly affordable method to make a rotary input gadget for audio mixing. After checking out a number of choices including turn tables as well as expert audio scrubbers, they made a decision on the difficult drive because of its size, price, as well as the feel of the disk. The geek aspect of utilizing a difficult drive as an input gadget most likely didn’t hurt either. They supply schematics as well as details on exactly how to make everything work. There’s a video after the break of the system sending signals to a computer. No performances though, sorry.