All 6 Uses

audible
in
The Lords of Discipline
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It's good to have an expert in deficiency rooming with us," Mark murmured almost inaudibly.†
Chpt 1.15

inaudibly = so quietly it almost couldn't be heard

standard prefix: The prefix "in-" in inaudibly means not and reverses the meaning of audibly. This is the same pattern you see in words like invisible, incomplete, and insecure.
Bo muttered in a trembling, barely audible voice, nervously searching the room for allies.†
Chpt 3.30 *

audible = capable of being heard
When we finally spoke, our voices seemed to violate the soundless scrimmage between the inaudible purr of the river and the green emergence of the gardens.†
Chpt 4.34

inaudible = not capable of being heard

standard prefix: The prefix "in-" in inaudible means not and reverses the meaning of audible. This is the same pattern you see in words like invisible, incomplete, and insecure.
"No, sir:" Pearce answered, though his voice was barely audible.†
Chpt 4.38

audible = capable of being heard
I'm sorry for everything," Tradd said in a barely audible voice.†
Chpt 4.41
Before I could respond, Pig angrily muttered a slurred, barely audible word that caused every eye in the room to fix on him in amazement.†
Chpt 4.41

Definitions:

(1) (audible as in: barely audible)
capable of being heard
(2) (meaning too rare to warrant focus)
In football, the term has come to include an instruction shouted from the line of scrimmage.

Recently, the word is also being used to indicate sounds that could be played on a phone or computer; for example "audibles include creative hellos that can be downloaded."