I came across this Fratelli Ruffatti - Pipe Organ Factory Tour Video, very interesting. You might find it so as well.
https://www.youtube.com/watch?v=egOBhLNMnTo&ebc=ANyPxKpgQJQLm0olkBvK_ewHr6ueYbUXUcSBaZX5vXbC7xvDo90t0dHADFngNRdy3xyPD5iQfaVr4ZLm4Sbi5qYfItWvorXa1A&nohtml5=Falsewhich got me to wonder if any of their organs have been sampled for Hauptwerk?
Likewise, the video following (The Willis organ of Liverpool Anglican Cathedral) does an excellent job of demonstrating various stops on this organ and how each of them sounds.
Rgds,
Ed