Audio setup is completely wrong.
I'm not going to completely disregard the possibility that something is wrong with my headphone settings, but if not, you have a MAJOR problem with your setup here. I've had a lot of experience with binaural beats, and the audio setup is completely wrong here. Each headphone should play it's own clear, unwavering tone, and the difference in frequency between the tones should be the desired brainwave frequency. Here you have it setup so each side of the headphones is playing the EXACT same WAVERING tone. This simply will not work. Your brain detects the frequency difference between the tones in each ear, and the wavering heard from a proper binaural setup is a result of this difference, NOT because you have made the tone in each ear waver. Please read up, maybe check out some real binaural programs, and resubmit this in a way that actually works, and you get a 10.
P.S. While setting the visual flicker color to black does indeed turn it off, I would maybe make a clear option to do so for people that can't figure that out. For some, audio is more than enough (me).