Amazing work! I'll definitely visit more often, these are great.
Minor quibble: the "Binaural Beat Machine" does not produce binaural beats. It plays two notes at the same time, to both ears, which produces an actual beat in each ear (pull off one headphone - you can still hear it). A nice example of how it should sound: http://en.wikipedia.org/wiki/Binaural_beats
It does combine both, as to work without headphones, but if you wear the headphones, you will have the binaural thing on top of the modulation. Two for the price of one ;-)
Minor quibble: the "Binaural Beat Machine" does not produce binaural beats. It plays two notes at the same time, to both ears, which produces an actual beat in each ear (pull off one headphone - you can still hear it). A nice example of how it should sound: http://en.wikipedia.org/wiki/Binaural_beats