That looks interesting - and sounds good too (at least in Jonathon Scott's You Tube post). First time I've come across 3 consoles controlling the same instrument. Are there any others (there are a good number of dual console instruments). There was an organ with no less than 5 consoles - see NPOR E01271. To be fair, the 4 subsiduary consoles were short compass and designed for specific purposes. It also had a barrel mechanism. Just one of the oddities of the pipe organ world!