(pro models without exception, not a Normandie in the bunch) clacked and popped more than an old bassoon.
I mentioned elsewhere that I did a good deal of research, at one time, on Leblanc keywork patents. I also owned and played several Leblanc-made intruments, from a Normandy wooden Bb clarinet, to a Leblanc paperclip contrabass clarinet to a Beaugnier-made Vito tenor (and several others).I know one Normandy (ie?) that does!