Casio Music Site Link

https://music.casio.com/e/
Link for downloading Music Data Management  Software and Music data for old Casio keyboards.
Now you can customize your HIGH-GRADE KEYBOARD or DIGITAL PIANO by adding Music Data (tones, DSP settings, registration memory data, songs, rhythms, etc).
WK-3300/WK-3800/WK-8000/PX-410R/PX-575R      
CTK-900/WK-3200/WK-3700     
CTK-691/WK-3000/WK-3500     
CTK-671