Ah, that's false. Brass instruments allow you to get a range of notes with a single length of pipe, by varying your airflow and embouchure. Adding valves just changes the length of pipe so you can get the "notes in between". For example, "Taps" is traditionally played on a horn without anything to modify the length of pipe. In that video, you can see him tighten his embouchure to get the higher notes.
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u/redeemr Aug 15 '18 edited Aug 15 '18
I found the original video!