I listened to these - very impressive work and amazingly great compositions by a composer I never heard of - even though I am a horn player. He is unknown to most horn players though should be known.
If you want any criticism - a lot of this sounds really great, however one thing that bothered me is the violin trills are all synchronized. That is impossible and never heard. As soon as two or more violins play their trills are totally non-synced. So that needs to be changed.
The other thing I noticed was on the horn - it requires a huge amount of breath to play a horn - it is a really long length of tubing - and this means there are lots of breath pauses while gulping for air. There are sections in this recording where this horn just keeps playing like a pipe organ. It is physically impossible. So I think it should be exaggerated to show the breath marks.
Also, on the notes that are so fast in the fast movement - you need to realize all those are in the upper harmonics, the upper partials, and all those notes accessed totally by lip movement, hand position in the bell, and air pressure ALONE - no valves. And so it is incredibly hard to play such fast notes high up in the register. If you normally just play in that area, you can smear chromatic notes all over the place like a glissando. That is in fact what a horn glissando is. A smear of higher range partials. What that means is that the player on this piece, using only lip and pressure, would have to also use a lot of tongueing for such fast notes, because you simply cannot play all legato on all those notes and have them seperately audible like an oboe or a flute or an organ. You can easily do it with samples, sure, because they were recorded that way -totally separate - but in reality there is no way all those fast notes could be separately played without more tonguing to force them into specific pitches and rhythms.
That is my overly critical reaction because I know how hard it is to play a horn in the high range ESPECIALLY without valves. It is nearly impossible to enunciate notes without tongueing them separately or having combinations like dee-ah-da-da-dee-ah etc.
But overall the sound is beautifully done, and what a great piece for horn that you have brought to light - that is a fine accomplishment in itself. Don't get mad - I do admire what you are doing with these lesser known composers.