Casio did a lot of weird things in the 80s, they were trying all kinds of stuff. Weird things like this combination synth, double cassette deck radio that came out sometime in the 80s obviously marketed towards…..??? Well, the only people I can think they possibly could have been making these things for were weird noise musicians of the future like the one shown in this video above.
This video by Z0NK0UT used the cassette and radio functions playing some answering machine tapes, and radio static piped though some fx then back into the mic input on the CK-500. This is truly a work of insane beauty.