The author of this app clearly doesnt understand the psychology behind alpha wave relaxation therapy. No phone is capable of reproducing the effects of the actual therapy. It requires low end stereo sound. Most people cannot truly "hear" 0-20hz but the effects remain regardless. Sad waste of time
I think its just written wrongly, as on the market description it suggest the difference between 400 and 408/9 hz is what creates the soothing effect in the brain of either 8 or 9 hz.
Not sure how true this may be as I am not a neuroscientist neither have studied this particular topic, however it is quite nice to listen to compared with silence
Also, it would seem that since this app does not have scaling settings, it does not fit with my DPI edited defy
Would be great if this could be added