Owner`s manual

Doing so not only will cause the software to malfunction, it
can also corrupt data and cause malfunction of your keyboard
and/or computer.
Configuration Using a USB MIDI Interface
Visit the URL below for information about obtaining a commercially
available SoundBlaster joystick-MIDI converter cable and USB MIDI
interface.
http://casio-europe.com/euro/emi/cms/midi/info/
Be sure to read the documentation that comes with your computer (with
Sound Blaster or compatible sound card installed) and the version of
Windows you are using for other important information.
If your computer does not have a joystick port, you can connect the
keyboard using the commercially available USB MIDI interface.