Bobby,
I briefly owned Ketron.
If I remember correctly it does not have a USB port only 5 pin Midi in / out
There are "workarounds". For example a 5 pin to USB cable. So in this scenario, you would plug both Keyboard and SD2 to computer. Telling computer that your Keyboard is input and SD2 is output.


However, if you are planning to stick to that module, perhaps it is a good idea to find a keyboard controller that has both, USB and 5 pin connectors. And usually these can be powered with external power supply. So, if you decide just to play, you would be able to do so without connecting to a computer.