I attempted to use with an XP upto date HP laptop. There is minimal directions for use, but I followed them. Loaded disc slected install, received message my version of windows is not supported. Went to web site downloaded the specific drivers for XP service pak 3, installed them still no luck. My system does not recogniaze the device when I plug it in,maybe my usb does not have enough juice, There is a jack on the back for a wallwort but the plug is not a standard size and will not accept any that I have available.I can only find M-Audio power supply's for firewire series. I don't want to throw another $25 away to M-audio when the item is not listed for USB series. I will try to return this but I'm certainly out the shipping costs