I'm using the wk-7500 and I followed the instructions of hooking it up to the computer, but it didn't work, all it said was usb not recognized, now I'm not even getting anything but the audio notification that it was plugged in. other than that nothing happens, I spoke to one tech person who sent me to a page of supported drivers and various things for windows 10, and I installed data manager 6.1, although I have no idea what it is and it doesn't seem to do anything, and a driver which didn't even list the specific keyboard model I was using but it was the best I could see for it. Then when I tried that and it didn't work, I called back, got a different tech guy who said that the other person wasn't supposed to even give that support and refused to talk about the issue with me, saying that casio tech doesn't handle issues with plugging in to the computers.very frustrating, I've been trying to get this resolved for so long, and I just have no idea what else to try. any ideas?