Moving Jaw With Audio

Hi all, I'm building a robot protocol with a mobile jaw driven by a servo, the goal is to move when you speak, using the audio signal to this circuit:

sound board controller

I wonder if it will be possible to introduce the adc audio port, and make a script to move the servo in relation to the audio. Make the script I see easy, but audio can now be entered directly or through some simple circuit to avoid damaging the card ez-b?