When you turn on the "stm" button (talking about the iPhone app), are you supposed to hear a single tone, or two tones alternating very fast?
I ask because I've heard that these things work by playing two different tones in each ear, and allegedly, you're only supposed to hear the difference between them.
Peculiarly enough, I recently tried a "theta" pure dose with this in mind, and I was able to concentrate until I heard a single tone, right between the two alternating tones.
Maybe this is just me being...
