Reply #8: Almost right, they move, hence not "standing".

[bemildred]

But a very interesting subject. One wonders if they obey
exclusion and uncertainty rules? I would guess they do because
of the quantization.

It makes sense that the lattice would have characteristic
frequencies, and quantization makes sense at the atomic scale.
Sound is energy, and all energy is quantized (AFAWK).

I expect there is some sort of resonance between the phonons and
the electron pairs that facilitates resistanceless movement at the
higher temperatures (speculating ...).

But I'm not up to the math any more ...