Frequency generator

Inspired by this two beautiful icons

@MVBen. http://dribbble.com/shots/794473-Video
@Nina Geometrieva. http://dribbble.com/shots/805972-Yes-No-3

I decided as an exercise to make my own. When I finished, the icon reminded me of a game that I played (Silent hill) and on a radio in the game that helped me to notice the creatures so ...
In honor of silent hill here is the frequency generator :)
Hope you like it ...