Audio - audible, audience, audile, audio, audition, auditory

From Latin audre, to hear.

From Greek aisthanesthai, to feel.

Of or relating to high-fidelity sound reproduction.

The broadcasting, reception, or reproduction of sound.

An audible acoustic wave frequency.

Emissary - emissarius, emittere, emissum, to send out: A messenger; an agent.

An agent sent on a mission.

An emissary may be a secret agent appointed not only to detect the schemes

Of an opposing party, but to influence their councils.

An agent employed to advance the interest among the people.

Buzzing emissaries fill the ears of listening crowds.