Leaking data through the sound card is a different matter entirely

from here

With the attention being paid to badBIOS and new research into covert acoustic networks, there are some people getting the impression that their computers can get infected through sound alone. They can't. Sound can be used for communication between already infected computers, but the actual infection still has to use more traditional methods like clicking on links or plugging in tainted flash drives.

(Inspired by Graham Cluley)