From the Mailbag: The “A” Valve

One common question relates to the “A” valve seen on most single Bb horns and descant horns. The central question would be “what is the purpose of placing the horn in the key of A?” Normally valve is usually used and tuned to be used as a stopping valve, such as in this prior article: The Stopping Valve: The Best Invention Ever I have noted that when I show students how a stopping valve is used on a single Bb horn or a descant horn they are...

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