[Antonio Freixas]

I don’t think you’re considering Viscosity Antonio! In the milliseconds of note valve open/attack, if the air has to move from further away than it would were it pushed by the bladder, it wouldn’t get there in time.

Nothing above makes any sense, sorry. You’ll need to try to explain more clearly before I can really comment.

In trying to decipher your meaning, it sounds like you might be comparing a rigid air chamber to an air chamber with a bladder. And perhaps you are trying to describe what happens right after a key is pressed? If so, are we looking at a case where someone is also blowing into the air chamber or a case where we are just relying on just what is in the air chamber?

supplying more air volume to the opening than the pressure front alone would permit…

As I said, “more air” is only possible if the bladder shrinks.

I’m not sure what “pressure front” you’re thinking of—I’m not saying there is or isn’t a pressure front, just that I don’t know what specific situation you’re picturing.