Much of that assumes a constant motor speed, which is a big assumption. But if you have a constant motor speed, what is it that different motor controllers or belt material or anything else is doing to affect the sound. By definition, a change is either adding something or removing something. So, what is the motor controller doing, other than maintaining constant speed, that is adding or subtracting from the sound that comes out. Same with the different belt materials.
Of course, you can go around and around in your head looking for explanations. but assuming the changes are real, they should be able to be defined and then reproduced. Maybe we cant do that yet with test equipment, but that doesnt prevent us from trying to understand what is happening, and thats what I'm trying to do, for my own understanding. And maybe, if I figure out some of the parts, my little brain can figure out the big picture.
Maybe the motor controller takes out little micro vibrations and thats why it sounds better. Maybe a different belt material does the same thing. I have to guess that it has something to do with vibration, because thats what the stylus picks up. Of course, there are issues of time domain and such, but that is just a shifting of when the vibration occurs in relation to others.
Again, assuming the squiggles in the vinyl groove are passing by the stylus at a constant, accurate rate of speed, the sound should remain the same regardless of other factors unless somehow other vibrations are being added or subtracted from what the stylus reads. then of course, we have what happens after the stylus sends out its signal.
