According to the Stoics a voice is corporeal since everything that is an agent or operates is a body; a voice acts and operates, for we hear it and are sensible of it; for it falls and makes an impression on the ear, as a seal of a ring gives its similitude upon the wax.

Besides, everything that creates a delight or injury is a body; harmonious music affects with delight, but discord is tiresome.
And everything that moved is a body; and the voice moves, and having its illapse upon smooth places is reflected, as when a ball is cast against a wall it rebounds.

A voice spoken in the Egyptian pyramids is so broken, that it gives four or five echoes..