To stimulate the brainwaves, you have to use different frequencies -
1-3 hz  - Delta waves (Deep Sleep) Theta waves (Creativity/Learning)
8-12 hz - Alpha waves (Deep Relaxation/Meditation)
13 hz   - Beta waves (Normal Activity)

Obviously this causes a problem because the Amiga can only produce a minimum
sound frequency of 20 hz. This was solved by connecting the device directly to
the parallel port. Simple !!!?

How to make the Hardware
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1 - Take the lenses out of the glasses
2 - Paint the cardboard black or put black tape over it
3 - Cut 2 pieces out of the card, to fit one in each eye hole of the glasses
4 - Make a small hole in the centre of each piece of card. Enough to fit a Led
5 - Fit the card into the glasses