Ok, in this video I've married the 2020 'HALLOWEEN.EU' animation with the music from the 2006 'Amstrad Expo Magic Circus' demo by 'Les Sucres En Morceaux'.
The music (a version of the The Stranglers 'Waltzinblack') is being produced on a second 6128 using a modified SCART cable.
https://www.youtube.com/watch?v=s9u6vF-QprY (https://www.youtube.com/watch?v=s9u6vF-QprY)
Links:
https://www.cpc-power.com/index.php?page=detail&num=17754 (https://www.cpc-power.com/index.php?page=detail&num=17754)
https://cpcrulez.fr/demostestDO_amstrad_expo_2005-magic_circus.htm (https://cpcrulez.fr/demostestDO_amstrad_expo_2005-magic_circus.htm)
https://cpcrulez.fr/demostestSL_halloween_amstrad_eu.htm (https://cpcrulez.fr/demostestSL_halloween_amstrad_eu.htm)
https://www.cpc-power.com/index.php?page=detail&num=7921 (https://www.cpc-power.com/index.php?page=detail&num=7921)
https://www.cpc-power.com/index.php?page=staff&lenom=Rity (https://www.cpc-power.com/index.php?page=staff&lenom=Rity)
https://en.wikipedia.org/wiki/The_Gospel_According_to_the_Meninblack (https://en.wikipedia.org/wiki/The_Gospel_According_to_the_Meninblack)
Not emulated - original hardware and software.
Please note that the aspect ratio for this YouTube video is 16:9 but the CPC monitor
has an aspect ratio of 4:3 so you may wish to adjust your viewing device accordingly.