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@Revenant It's interesting that the title of this demo sound like exactly like the pronunciation of the word 'no problem' in Chinese. But from the music itself it is more like a soundtrack of some Kung-fu movie. I didn't find the service manual before, and thank you for letting me know this. on DemoDB site there's a special page list all collected demo song composition/created by Alstrom and you can see it here: https://demodb.org/songs/edward_alstrom_collection (it is the same as the lifesea.org/keyboard, I just bought a new domain so people can find it more easily). I guess the CT-870 might have many regional variation with different voices and rhythm inside. Maybe the Russian CT-870 has a different demo song (seems not likely to happen). By the way, there's also CT-877 which looks the same as CT-870, do you know what's the difference between CT-870 and CT-877?

@Szo That's great! Your photos of models would be very helpful for my site. How can I get in touch with you, and have those pics? There's a mail address on authors section of demodb's index. Can I have your mail address too? By the way, I have also create a page on RadioShack product based on your post, at here: https://demodb.org/other/radioshack . I'll translate it into English later.

Cool, as far as I know Radio Shack MD-500 is MEDELI MC36, a low budget pcm sampled keyboard.

Hello @Revenant, I'm the co-editor of the demodatabase site you mentioned in your post. Really surprised that the demo song of ct-877 is created by Ed Alstrom, I feel that this demo song sounds like chinese style but might not composited by Chinese, but I never thought it is Alstrom's work. Amazing! Do you have more details on this demo and other Alstrom's demo work? Yes China-specified models continues to use CT prefix until 2005-2007, almost all modesl ended with the number 8 (CTK-738 / CT-588 / 688 / 788 / 888) and are the variant of CTK models of the time. The difference between china version and global version are Chinese ethic instruments, some chinese styles and the panel printed in Chinese, and contains internal Chinese Song as demos. You can also listen to CT-788/88's exclusive demo (Spring Festival Overture) on the demodb site. I'm also trying to collect more demos from CASIO's china localized models like CT-588 and CTK-6320.