Quote Originally Posted by hoglahoo View Post
That is correct. But if the sound from the falling tree cannot be detected because nobody is around to detect it, then it cannot be heard. And if it cannot be heard, then you are saying it is not sound. So then the falling tree did not make a sound
just because it isn't heard does not make it incapable of being heard. Remember my recording devices and the innumerable animals that also can detect sound? Besides sound doesn't take a passive observance to make it sound. When sound becomes detected, it is heard. If it isn't heard it doesn't cease to he sound.