Audio; not restricted to a certain type of transmission...

Literal...

To hear good news in a dream, denotes that you will be fortunate in affairs, and have harmonious companions; but if the news be bad, contrary conditions will exist. ...

This is a classic ex- ample of contrary omen; the worse the news in your dream the better will be the news you get, and vice versa....

Banding together in communication for a common cause...