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398 Posts
My Conn 10m has a small tone hole below the right hand thumb rest, near the Eb tone hole:
As far as I can tell, it closes when I press down RH2, and isn't affected by any other key on the horn. What's its purpose? My other horns don't seem to have anything similar. I only noticed it was there when it's post worked its way loose, causing D and E to go very sharp and airy. My only theory is that it could have been used for an alternate fingering that a tech disabled at some point, but that's no more than a guess.
As far as I can tell, it closes when I press down RH2, and isn't affected by any other key on the horn. What's its purpose? My other horns don't seem to have anything similar. I only noticed it was there when it's post worked its way loose, causing D and E to go very sharp and airy. My only theory is that it could have been used for an alternate fingering that a tech disabled at some point, but that's no more than a guess.