Excitement level in OCEAN model So, I would like to know what facet regulates these behaviours / cahracteristics of a person:


How loud and fast-talking they are (on average).
Their excitement level (on average).


Excitement seeking (1) (2) (3) (4) is defined as facet that tells how much a person seeks excitement, but does it tells how much a person is excited on average? And if not then what facet tells that?
It sounds like an aspect of extraversion. I.e., loud and fast talking sounds like gregariousness and assertiveness.  In general, extraverts are also more active and expressive.
For example, the NEO-PI-R has facets of extraversion as follows:
(E1) Warmth (E2)
Gregariousness (E3) Assertiveness (E4) Activity (E5)
Excitement-Seeking (E6) Positive Emotions
Fast talking might also be linked to intelligence.