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is it safe to line my walls with lead and how thick would it have to be to exclude these non natural frequencies.
I'm affecting your behavior via an electronic device as you're reading this!!! 
... I don't suppose you have any pictures of this device in action? 
BTW allegedly you can use sound waves, (as opposed to electromagnetic), to modify brain waves ...http://en.wikipedia.org/wiki/Binaural_beats#Hypothetical_effects_on_brain_functionTry at your own risk ... http://www.freesound.org/packsViewSingle.php?id=2647 (headphones required)
What is the difference between an electromagnetic frequency at say 60hz and a sound wave of the same frequency?