That is what remembered seeing! Thank you. Now, I wish it was the whole length of the main pathway.
Ah well...K am going to do something entirely weird anyway...
A completely folded in horn with zero space between passages and no valves...a few well-placed holes to trigger a change in the standing wave.
I figure if I could play my school fight song on a conch shell using my hand in the bell...then I could probably drill enough holes to make SOMETHING happen.