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This machine used to be on permanent display in the Evoluon, a museum dedicated to technology and modern art in Eindhoven, the Netherlands. See here. This site is run by a man named Kees who may be able to answer your questions.
Behind each of the models, there is a faint picture of a Volkswagen Beetle. At first I thought of some form of subliminal advertising, but they must have needed some way to show relative height. And a Beetle is of course fairly universal.
It would have been nice if the author had provided some examples of music that his model predicts. If I walk a circle in his four-dimensional space, what does it sound like?