Imad, I remember reading an article in which the cause of tremor was described exactly in the same terms as as your engineering model, interestingly rigidity was also postulated in the same way - as a fine extreme of oscillation, and linked to the sensation of 'internal tremor' that many pwp with no apparent tremor feel...... for those of us who had no way to describe this prior to dx it was often put down to panic attacks, which I KNEW was not the case! It is fascinating that there is a mechanical/physical model there.....
neurotransmitters again, I think.....