• Connect one end of a MIDI cable to the “MIDI OUT” port on the rear of the GEC
• Connect the other end to the “MIDI IN” port of the Casio keyboard
• Go back to your GEC and touch the “DISK” tab at the bottom of the touch-screen
• In the middle of the screen you will see “MIDI Sys Exclusive Commands.” Select the “CTK-900” by touching it.
• You should see a message indicating that the GEC is transmitting MIDI data, and the keyboard should say “BULK IN” on the front screen.
• Once the messages leave, your data has been successfully transmitted.