of course, this is a natural selection problem. far beyond numbers or instruments. my son-in-law is a physicist working for the Allen Institute. they do brain research. he assembles big data for the neuroscientists.
he said in maybe 10 years they will be able to replicate a cubic cm of mouse brain tissue. but right now it’s too much data to replicate. he does not think he will live long enough for them to be able to do that for a cm of human brain tissue. just too much data.
so when we think that we can measure what our senses have evolved to sense, we are kidding ourselves. and not just the hearing part. the whole body is involved in whether we think something is fake or real.
which is why getting as close to absolutely steady as possible means more to our musical sensibilities than what we view as corrected speed. there are no naturally occurring servos.
In general, accurate rotation is obtained by servo-control by negative feedback, but at the micro level, if it rotates or becomes faster, it detects it and slows it, and repeats the operation to make it faster if it gets slower. If you try to measure a period with a small level, you cannot measure the instantaneous state, so you should measure the average value. Therefore, fine vibration generated by servo-control cannot be measured by the measuring instrument, it depends on the human ear.