There is that demo called "magic circle" from demogroup "european technology", the music is awesome and I wanted to extract it .mod. I did try some rippers : burp 221, mrip 254, mrip280, rippr500 but no one could detect medias. here is pouet.net link and here is youtube link. I was thinking about maybe using dosbox to log what's sent to the gravis ultrasound?
youtube
demo