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This links to a Facebook post from Willson, showing a valveset to interpose in an alp horn.
I guess you would need a different valveset with different slide lengths for each pitch of alphorn.

https://www.facebook.com/photo.php?fbid ... =1&theater" target="_blank" target="_blank

Here's another 'take' on a chromatic Alphorn... the chromatic part begins at about 5 minutes.

http://www.youtube.com/watch?v=i3UKbtjabGM

By-the-way... traditional Alphorns are pitched in F or F# (Gb as the Europeans say).

About the original post... Most Alp horns I see have two top sections. One for Gb and one about 8" longer for F. 'Plugging' the F horn valve section onto the Gb Alp horn setup would drop the higher pitch to F. My Alp horn was made some years ago and has a separate center section that's about 8" long.

I had not thought about doing this with my own Alp horn but plan to do so with one of the F horn 'carcasses' I have hanging from the shop ceiling.

Thanks to the OP for the post.

It was a cultural, pre-electronic tweet from one mountain to the next, an invitation to come on over für eine bier.

http://youtu.be/pFYS2N8KBXs" target="_blank" target="_blank

Dean E wrote:It was a cultural, pre-electronic tweet from one mountain to the next, an invitation to come on over für eine bier.

http://youtu.be/pFYS2N8KBXs" target="_blank" target="_blank" target="_blank

sort of like "alphornchristmas"