I think it would be a better investigation if you observed terminology _in
use_, ie extracting terms from a dialogue. but here goes:
a sample: bright, grainy, noisy, clicky, evolving, harsh, smooth, clean
a mix: muddy, sparse, terms relating to space, volume, depth, "closeness"
of sounds, tight, heavy, crisp, blurry, light and shade, brash, contrasty
(yeah contrasty's a word...)
that sort of thing?
-poil-