Well, i thought that the writings on the disk were "DEMO MANIA", with the NIA not being so clear. Can you see for yourself on the disk? Demomania was a tool to make demos, as far as i recall.
Still doesnt help you with the demo though. Can you please explain what a "Sottofondo song" means?
If still no luck, try to post your question on
www.pouet.net (in the bbs).