How do I animate emission with an audio file? In cycles, 

I want an audio file of speech to cause an emission surface to change the amount of emission strength to match the volume from the voice actor's audio file. 
No sound = 0 strength
Loudest sound = 10 strength

How do I connect one event to control the other?
Also, can a specific audio file can be isolated to ignore other dialog and sound effects?
For convenience later on, I'll add a Value node, which you can connect to the emission strength or any other input.


Set a key on the property, which you want to be "animated" by the sound wave.

In the graph editor, execute Bake Sound to F-Curves.

Adjust the resulting F-Curve with an Envelope modifier, mapping the output from 1 to 10. Or map the input from 0 to 1 and add a multiply node in the cycles material nodes to multiply it with 10.