The horn had to be loud

I'm actually deaf now

You don't need thousand keys for every note 😃 by brass instruments it is normal.

@@TheKalokagathia sure, but don't most trumpets at least have 3 or 4? This horn doesn't have any, so it has to be done entirely with breath control, which must be more difficult.

@@Blokewood3 you blow air between your lips, pressed tight so they vibrate. You shape the mouth and tongue, together with force of breath to set tone. The valves of a "modern" horn essentially gives you three, four etc separate istruments as each valve changes how far the air needs to travel. All brass players has to do this, the valves just allows them a greater range of sounds... and the trilling half notes... simply put you get more out of one instrument with valves where else you'd need three or more separate instrument.

​@@Blokewood3 French horns have partials that are closer to together. It is different from the partials that the trumpet, trombone, euphonium, and tuba have. The french horn is conical and has a very long length to ratio of the mouthpiece size

Bonjour, merci de votre message. Pour faire des demi tons ou des gammes complètes, il faut utiliser la technique des sons bouchés. Voir ave maria de schubert sur ma chaîne KZfaq

I play a German horn.