[Openeeg-list] Weird Question

[damian <dmo...@aa...>]

I know this is a weird question and totally sought of topic and those
academic will totally get annoyed. Basically i had the eeg running and
though i would see what would happen if i taped an electrode on either
side of a quart crystal and put the ground underneath. The signal was
probably about as inteligable as that of my brain at the moment. I am
reading through a good book at the moment on eeg so will understand
eventually. Anywhos when i place my hand above the crystal not touching
it. The signal would change. Basically all the rubbish had gone and was
centered around 7hz. 
Ok so the question is using brainbay how do i get the peak signal from
the fft and modulate an audio signal say 200hz with the peak frequency. 
Cheers
Damian