Distinguished SOTW Member/Mouthpiece Maker
But the material on the walls of the room also have an effect. Sometimes it's absorbed in the walls and sometimes it passes through the walls. Sometimes the material absorbs/transmits certain frequencies better than other.
I'm not so sure it is. Imagine an extreme example -- a sax made of foam. Will it sound the same as one made of brass (of identical dimensions, of course), or will the vibrations of the air column be dampened by the foam? If something can dampen the resonance column, then everything can.True, but totally irrelevant to woodwind acoustics.