In essence yes. I'm a performer and not an expert on these matters. However, as I understand it the smoother the bore the better the sound due to the sound waves bouncing around within the instruments bore. If you look down, say, a cheap Adler wooden recorder with the end towards the light and then down a Moeck or a Von Huene for instance you would see the difference. The latter are very smooth and the former is very rough, so much so that you can se the openness of the grain. You can't actually see splinters but not far off!!! I'll show you when I'm next around. Get the Guinness in!