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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

Use 7zip https://www.7-zip.org/ to unzip archive Music Data Management Software for CTK-671 Music data (DSP Settings / Registration memory/ Rhytms/ Song/ Tone) Software downloaded from CASIO Music Site http://music.casio.com/e/ Casio CTK-671 Instrument definitions.ins for Cakewalk Sonar Manuals: CTK 671 User Manual.PDF CTK 671 MIDI implementation.PDF CTK 671 Service manual.pdf

Casio CTK-671 Instrument Definitions file for Cakewalk Sonar