[Ofir]

I believe that it can partly be tested using longer pipes, although we must address the following issue:
It is clear that the air pressure will eventually equal in the extended chamber (air chamber + pipe). However, using longer pipes (vs. just a bigger air chamber) will probably differ in the pressure waves moving on a new phrase (or on each new note).

Using my own experience, I’m getting a smoother tone using my Yamaha with a pipe, compared with a mouthpiece.