I have discovered a way to have my new B-flat horn change back and forth from an ascending 4th valve to descending stopping valve. This isn’t actually all that unusual except that my new design requires no restringing or turning rotors. The switch can be made between movements, even in the middle of long rests if the need is there. This means that you can have access to the easy notes of the ascending horn without sacrificing the ability to play stopped notes or use an F extension. Pictures are on the way!