I have panning of audio where 1 track is
panned completely from left speaker to the right
speaker, something like using balance knob
and turning it from right to left and back.
That's done with pan on keyframes
but instead of moving sound clearly left/right
the sound from both speakers merelly sounds
as louder or softer, giving not much impression
of some sound source being moved from left to the
right in the space.