A USB to MIDI connector is $20-$30.

Hope you have solved a problem. I have a MIDI to USB converter that takes MIDI and passes it to a USB port on the computer. I have never found, and want, a converter that takes the USB output from one of my cheap Yamaha keyboards, same output as the Casio, and converts it to a std. MIDI. I want to use the cheap Yamaha keyboard as a 2nd manual for my Tyros 4.

Could someone post a link to the needed converter?
regards, chuck

Personally , I don`t have much experience with MIDI , but here is a link.

http://www.midi.org/aboutmidi/tut_midicables.php

Good luck

Gary