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I've been through the Internet, and came across a very cool project - a homemade mindmachine
http://ladyada.net/make/brain/index.html
something like a simple generator for glasses and headphones.
IMHO - the idea is to combine the MM and the sunglasses very sensible. It is not clear why the developers still don't release such priborchiki. Well, really more functional.
I did not understand just about the session - it seems there is generally one session only, or am I confusing you?
PS, be sure to check out the video - be it colorful with a manicure.
PPS do not seem to Bayan, the site seemed to be no more.

Oh yeah. especially photo.
where's the pattern then? che's got a microcontroller?

schA all will write the pattern they have stored in a sly git
there is an older schema http://makezine.com/images/10/SLMfirmware.pdfbut the principle is clear - there will http://makezine.com/images/10/SLMfirmware.zip
everything is based on the microcontroller (the cheapest, as I understand it). The microcontroller pulls and LEDs and generates binaural beats. The program itself is as I understand it is one .

how sound is made? where is DAC?

a simple generator is made, I understand.
ECCO, it's a simple hack, not harder

The pattern did not see.
ATTiny2313 really inexpensive , only now to find it problematic (I failed to order a mail -forwarding expensive at times , and hardly anyone will receive 1 piece).
I wonder how much time was spent on writing and debugging programs for this "simple DIY" ?

who knows something dude, really, advanced. Shemka http://makezine.com/images/10/SLMschematic.pdf - I just touched the vast world of microcontrollers, and understand it's POWER, but must have brains...
We have in the store are there, for 100 rubles or something for stone.

Swaga
You don't know the specs of the resistors that are there before the diodes go?

in the diagram drawn, 47ω, you can take the most small, like 0.25-0.5 W