Digression: some unconventional dimensions of sound

 ‐volume as in breadth, fullness or mass
 ‐can be accurately defined?

 ‐accurate definition: a given high/low energy balance metric
 ‐one of the few accurate timbre related metrics

 ‐spectral density measure
 ‐can be defined accurately but is very difficult to make psychoacoustically linear

 ‐singing formants
 ‐nasal sounds
 ‐brass instruments
 ‐this is fuzzy!