Sound, considered as something carried and stored. What reaches a mind through the ear.

A sound returned by a surface, arriving later and changed. An echo proves both the sound and the room.

The first stage that raises a weak signal enough to be worked with. Everything after it inherits what it did.

What the ear receives — vibration carrying meaning; the sensory channel where words are heard before they are read.

A sound's character beyond its pitch — warmth or edge in the voice; in color, one step of a hue.

How much space a thing occupies, and how loud it is. Both are amounts of presence.