[sdiy] LFO, analog computers

[Sebastian Kuehnl]

--- Matti <matti at devo.com> wrote:
> Two things on my mind lately, and I was wondering if the list had anything to
> offer.
> 
> 1)In trying to produce theta waves in the brain, I wondered if I couldn't
> simply 
> set an oscillator to 4-7 Hz, instead of putting one wave with some frequency 
> into one channel, and another with a difference in frequency of 4-7 Hz into
> the 
> other. Will normal speakers/headphones output such low frequencies? What
> about a 
> soundcard? Most give a range of 20-20kHz, but shouldn't lower frequencies
> come 
> out fine, or amybe distorted?

Oh sub audio frequency pulsing can well damage your speakers and ears (caution
when listening to Charles Cohen ;) The hypnosis experiments you speak of are
usually conducted on carrier sound modulated by the Theta waves. Cool Edit 96
(don't know about later versions) used to offer "brainwave synch" modulation of
stereo soundfiles as well as having some interesting starting information on
this field.

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