demos for the SD40 are not required. Its simply a module version of the SD7.
I was in direct contact with Marcello Colo, he was less clear about it and said it rather had the soundset of the MidjPro, which is not 100% that of the SD7.
I guess it would be a good idea to have a few more demos, at least that's probably what prospective buyers think, and also an online manual. I don't know how many buyers like doing a blind bargain.