In this case, Ze Frank has developed a voice painting system to draw with using only your voice. For example, with this program, low volume curves counterclockwise, medium volume is straight, high volume curves clockwise. As you can tell in the video of Ze's friend using this, it is not an easy-to-use way of painting, but it is pretty amazing!
Below are some screen grabs of some faces Ze attempted to draw. They are kind of creepy in my opinion, but at the same time awesome. Enjoy!