I'm guessing that most any modern PC will not have midi connections. If you have a device that has midi outputs then you need a way to convert the midi connections to USB. Some midi devices use a USB port so that you can directly connect them to the PC without using some kind of converter. So, in the end, all midi devices are connected to the computers via a USB port (unless you are using a really old PC). Since you are running WinXP Pro, USB is fully supported so PA9 should work fine. --Larry