William,

[ypu wrote]

> no, AUDITORY is about how your ears work; "acoustic" is about the sound
> waves as they travel thru the air (or other medium, e.g. when you're
> talking under water).
>
> articulatory, acoustic, and auditory phonetics are all extremely important
> to understanding the nature of speech sounds, and therefore to
> understanding how they correspond (or not) to graphic symbols in writing
> systems.

[mariano]
Very good. Thank you for the distinction.
Now I will try to learnt about auditory phonetics, because I am not confident
about Jacobson's phonetic features as being really relevant.

Yours cordially,
mariano