In my ether model, the way vibration started was that ultimately-rarified, elemental, "points" within a first-causal universal oscillation of (the only possible universal substrate which could have produced a universal ether), original-space, underwent oscillatory fatigue, in which adjacent elemental point-localities fell together into Yin Yang couplets. (Oscillatory fatigue is a known process. It occurs in metals.) Then, within that oscillational substrate, the couplets necessarily had to equilibrate, so that they reverted to singleton elemental units, which then were out of phase with the oscillations, which broke the symmetry of the oscillation, so that reciprocal oscillations became independent vibrations of intimately-neighboring elemental units, which interacted with each other, in what was now a universal ether, via an intimate-contact vibration mechanism.
River, if you want to check on this model independently, you could search any of these terms in Wikipedia, such as "equilibration," etc.