I'd like to convert this: http://www.parts-express.com/pe/showdetl.cfm?Partnumber=060-640&utm_source=googleps
to a USB? An ideal solution for me because of cost would be to use an existing usb controller from a usb keyboard. I was hoping someone might help bridge the gap in steps. What is necessary to wire the connector to the usb controller? Any help whatsoever would be much appreciated.