Actual experiments have been done in the area of synchronizing sound waves that have produced levitation (of relatively light-weight objects), and the researchers have speculated, rather vaguely, about "some sort of etheric process" being at work. -I have not yet seen anyone propose a detailed model for how etheric effects like this are produced (other than mine.)
Acoustic levitation is a pretty well understood phenomenon. I've never heard anyone speculate about "etheric processes"
It's just a standing sound wave that produces pressure on the object (usually from both above and below via a transducer and reflector)
It's explained pretty well on
Howstuffworks.com