Posted by Sam on May 21, 2003 at 11:03:24:
How in the world would you physically play this...the fourth valve that is?  Has anyone ever seen a worse valve setup?  I know the horn is of poor quality in the first place, but the design just defies logic.  
http://images.auctionworks.com/fullView.asp?img=http://images.auctionworks.com/hi/46/46167/4_valve_euphonium_cleaningkit.jpg